YOU SAID:

you move you feet you lose your seat

INTO JAPANESE

あなたは席を失う足を動かす

BACK INTO ENGLISH

you move your legs losing your seat

INTO JAPANESE

あなたは座席を失って足を動かす

BACK INTO ENGLISH

You lose your seat and move your legs

INTO JAPANESE

あなたは座席を失い、足を動かす

BACK INTO ENGLISH

You lose your seat and move your legs