YOU SAID:
Yesterday I went to the beach and while I was at the beach I saw a turtle
INTO JAPANESE
昨日、私は海に行き、海にいる間に亀を見ました
BACK INTO ENGLISH
Yesterday I went to the sea and saw a turtle while in the sea
INTO JAPANESE
昨日海に行ったら、海の中で亀を見ました
BACK INTO ENGLISH
When I went to the sea yesterday, I saw a turtle in the sea.
INTO JAPANESE
昨日海に行った時、海で亀を見ました。
BACK INTO ENGLISH
When I went to the sea yesterday, I saw a turtle in the sea.
Come on, you can do better than that.