YOU SAID:
That was why he was so surprised to receive this letter
INTO JAPANESE
それで彼はこの手紙を受け取ってびっくりしました
BACK INTO ENGLISH
So he received this letter and was surprised
INTO JAPANESE
それで彼はこの手紙を受け取って驚いた
BACK INTO ENGLISH
So he was surprised to receive this letter
INTO JAPANESE
だから彼はこの手紙を受け取って驚いた
BACK INTO ENGLISH
So he was surprised to receive this letter
Come on, you can do better than that.