YOU SAID:

I went to the beach today and I swam with sharks

INTO JAPANESE

今日は浜に行き、サメと一緒に泳いだ

BACK INTO ENGLISH

Today I went to the beach and swam with a shark

INTO JAPANESE

今日私は浜に行き、サメと一緒に泳いだ

BACK INTO ENGLISH

Today I went to the beach and swam with a shark