Complex sentence: House of Prayer Christian Church was started by a group of men and women, led by Ron Denis, in 2004 splintering off of New Testament Christian Churches of America, Inc. Several dozen of these people were ministers.
Split into simpler sentences: House of Prayer Christian Church was started by a group of men and women, led by Ron Denis, in 2004. It was at that point that these men and women extracted themselves from New Testament Christian Churches of America, Inc, several dozen of whom were ministers.