Complex sentence: He was the son of fellow billiards pro Jacob Schaefer Sr. (1855--1910), who was known as "the Wizard" by reason of his exploits with the cue.
Split into simpler sentences: He was the son of fellow billiards pro Jacob Schaefer Sr., (1855--1910). His father was known as "The Wizard" by reason of his exploits with the cue.