Sumaho o otoshite, gamen o kowashite shimaimashita.

I dropped my smartphone and ended up breaking the screen.

Saikin hatarakisugite, taichou o kowashite shimaimashita.

I have been working too much lately and ended up ruining my health.

Uso o tsuita koto de, kare to no shinrai kankei o kowashite shimatta.

By telling a lie, I ended up ruining my relationship of trust with him.

Tomodachi kara karita kamera o, fuchuui de kowashite shimaimashita.

I accidentally broke the camera I borrowed from my friend due to carelessness.

Tsumetai mono o nomisugite, onaka o kowashite shimaimashita.

I drank too many cold drinks and ended up upsetting my stomach.

Watashi no yokei na hitokoto ga, sono ba no fun'iki o kowashite shimatta.

My unnecessary comment ended up ruining the atmosphere of the place.