Simple sentence and compound sentence

"The ponies and the horses are in the barn." is a _________ sentence.

Herbie won a stuffed gorilla; Alma won a stuffed tiger." is a ________ sentence.

Is this sentence correct "I adore cat, my younger brother likes fish"?

"Nate found a wallet, and his sister brought it to the lost-and-found." is a correct sentence. True or False

"Martha and Peter are going to visit their grandparents next weekend." is a simple sentence. True or False

A simple sentence contains two or more clauses. True or False?