Complex sentence: Joey Dunlop (Robert's brother) and Michael Rutter have each won thirteen races.Michael and William (both sons of Robert) have also won races at the North West 200.
Split into simpler sentences: Joey Dunlop (Robert's brother) and Michael Rutter have each won thirteen races. Michael Dunlop and William Dunlop (both sons of Robert) have also won races at the North West 200.