Complex sentence: Rev. Joshua Peterkin had been known for his solicitude toward African Americans, having served at St. James African Church in Baltimore, and soon reestablished a school to teach them which Dr. Empie had established in 1845.
Split into simpler sentences: Rev. Joshua Peterkin had been known for his solicitude toward African Americans, having first served at St. James African Church in Baltimore. He soon reestablished a school to teach African Americans which Dr. Empie had established in 1845.