Questions about example sentences with, and the definition and usage of "Kumamoto"

A: × In Kumamoto City, Kumamoto Castle is under the repairing to mend what was broken by the greate earthquake in 2016.
✓ In Kumamoto, the Kumamoto Castle is under construction to repair what was damaged in the 2016 great earthquake.

× The moan was emptied to get rid of scraps of its stone walls.
✓ The moat was emptied to get rid of earthquake debris.

× Also about 50 stuff of members were into water and caught fish with net.
✓ In addition, about 50 staff members went into water and caught fish with a net.

× According to the city, Gin-buna and Orange freshwater goby caught by stuff reached 108 and all of them were released into nearby river.
✓ According to the city, there were 108 Gimbuna and Orange freshwater goby fishes caught by the staff and all of them were released into nearby river.

× Alien species like Largemouth bass and Crayfish, about 300, were killed because they had bad impact in the native ecosystem.
✓ About 300 Largemouth bass and Crayfish, not native to Japan, were killed because they had a bad impact on the native ecosystem. (or they were harmful to other creatures in the native ecosystem)

× The cleaning will have done by 3rd in 2023.
✓ The clearing of debris is scheduled to be completed by March 2023.

× The staff said ''There is still parts of Kumamoto Castle that need to be repaired.
✓ The staff said ''There are still parts of Kumamoto Castle that need to be repaired.

A: × In Kumamoto City, Kumamoto Castle is under the repairing to mend what was broken by the greate earthquake in 2016.
✓ In Kumamoto City, Kumamoto Castle is under repairs to mend damages caused by the great earthquake in 2016

× The moan was emptied to get rid of scraps of its stone walls.
✓ The moat was emptied to get rid of debris from its stone walls.

× Also about 50 stuff of members were into water and caught fish with net.
✓ Also, about 50 staff members entered the water and caught some fish with nets.

× According to the city, Gin-buna and Orange freshwater goby caught by stuff reached 108 and all of them were released into nearby river.
✓ According to the city, the amount of Gin-buna and Orange freshwater goby caught by staff reached 108 and all of them were released into a nearby river.

× Alien species like Largemouth bass and Crayfish, about 300, were killed because they had bad impact in the native ecosystem.
✓ Alien species like Largemouth bass and Crayfish, about 300, were killed because they had a bad impact in the native ecosystem.

× The cleaning will have done by 3rd in 2023.
✓ The maintenance will be done by the 3rd quarter in 2023.

Made a lot of changes, please ask if any questions regarding any

A: × I’ll use highway and retern home by a day.
✓ I’ll take the highway and return home in a day.

A: × Kumamoto City tried to set the free day of all the buses in the city.
✓ The Kumamoto City council decided to make all the buses free for a day, as a test.

× The trial results in surprising Kunamoto city people's movement in the town that day.
✓ The results were a surprising increase in the number of people travelling by public transit.

(We don't need to say Kunamoto City people in the second sentence because it is assumed they are from that city based on the first sentence.)

A: The sentence sounds natural, but you have some mistakes.

"Mt. Aso, which is in Kumamoto Prefecture, erupted yesterday."