Complex sentence: He was best known as "The Boss" in a series of Bell Canada television commercials in the 1980s and for voicing the character of Yukon Cornelius in "Rudolph the Red-Nosed Reindeer".
Split into simpler sentences: He was best known as "The Boss" in a series of Bell Canada television commercials in the 1980s and for voicing the character of Yukon Cornelius in Rudolph the Red-Nosed Reindeer. Mann voiced the character of Yukon Cornelius in "Rudolph the Red-Nosed Reindeer".