Complex sentence: John McCauley (b.1945; d. June 3,1989) was a NHL referee, who became a referee in 1970 was forced to retire due to an eye injury in May 1981; he was subsequently given the position of Assistant Director of Officiating.
Split into simpler sentences: John McCauley (b.1945; d. June 3,1989) was a NHL referee from 1970 until he was forced to retire due to an eye injury in May of 1981. He was subsequently given the position of Assistant Director of Officiating.