Complex sentence: Between 1910 and 1913, Mason allowed two groups of white Pentecostal clergy to use the COGIC name and credentials: one led by H. A. Goss, and another led by Leonard P. Adams.
Split into simpler sentences: Between 1910 and 1913, Bishop Mason allowed two groups of white Pentecostal clergy to use the COGIC name and credientials. One group was led by H. A. Goss, and the other by Leonard P. Adams.