the apostles were writing only these decrees, because gentile converts were going to church on the sabbath day. they had heard god's law read and expounded every sabbath in the synagogues and did not need further instructions.

Make this proper case
The apostles were WRITING only these decrees, BECAUSE GENTILE CONVERTS WERE GOING TO CHURCH ON THE SABBATH DAY. They had heard God's law read and expounded every Sabbath in the synagogues and did not need further instructions.