Complex sentence: John Bill Ricketts (died 1799), an Englishman who brought the first modern circus to the United States, began his theatrical career with Hughes Royal Circus in London in the 1780s, and came over from England in 1792 to establish his first circus in Philadelphia.
Split into simpler sentences: John Bill Ricketts (died 1799) was an Englishman who brought the first modern circus to the United States. Ricketts began his theatrical career with Hughes Royal Circus in London in the 1780s, and came over from England in 1792 to establish his first circus in Philadelphia.