Complex sentence: Reed completed the building of St Paul's Anglican Cathedral to the designs of William Butterfield after that architect resigned the project in 1887; he was faithful to the design, but provided most of the furnishings, including the elaborate pulpit.
Split into simpler sentences: Reed completed the building of St Paul's Anglican Cathedral to the designs of William Butterfield after that architect resigned the project in 1887. Reed was faithful to the original design, but provided most of the furnishings, including the elaborate pulpit.