YOU SAID:

I have fallen in love with my best friend who works at a restaurant who is also a senior

INTO JAPANESE

先輩でもあるレストランで働く親友と恋に落ちた

BACK INTO ENGLISH

I fell in love with a best friend who works at a restaurant that is also a senior

INTO JAPANESE

先輩でもあるレストランで働く親友に恋した

BACK INTO ENGLISH

I fell in love with a best friend who works at a restaurant that is also a senior