YOU SAID:

I was on trending but I fell and broke my leg

INTO JAPANESE

私はトレンドに乗っていたが、落ちて足を壊した

BACK INTO ENGLISH

I was on the trend, but it fell and broke my leg

INTO JAPANESE

私はトレンドにあったが、それは落ちて、私の足を壊した

BACK INTO ENGLISH

I was on the trend, but it fell and broke my leg