YOU SAID:

When the horse jumps around he makes lots of noise, frightening others

INTO JAPANESE

馬が飛び跳ねると大きな音を立て、他の人を怖がらせる

BACK INTO ENGLISH

When the horse jumps, it makes a loud noise and frightens others.

INTO JAPANESE

馬がジャンプすると、大きな音を立てて他の人を怖がらせます。

BACK INTO ENGLISH

When the horse jumps, it makes a loud noise and frightens others.