Complex sentence: Not until August 1860 was the only organ installed in the church however, this was not without some controversy among the congregation, many who still held the puritan belief that organs were tools of the devil and had no place in a church building.
Split into simpler sentences: Not until August 1860 was the only organ installed in the church. However, this was not without some controversy among the congregation, many of whom still held the puritan belief that organs were tools of the devil and had no place in a church building.