Complex sentence: He became the station's political reporter until he began co-anchoring "Good Day New York" in 1988, a position he held until 2005, when WNYW threw an on-air retirement celebration for him.
Split into simpler sentences: He became the station's political reporter until he began co-anchoring "Good Day New York" in 1988, a position he held until 2005. When WNYW threw an on-air retirement celebration for him.