Complex sentence: On that same night, Danny Gallivan made his debut as the English language play-by-play announcer for the Canadiens, marking the beginning of a 32-year career for Gallivan.
Split into simpler sentences: On that same night, Danny Gallivan made his debut as the English language play-by-play announcer for the Canadiens. It marked the beginning of a 32-year career for Gallivan.