Complex sentence: His father was John Weigel, a broadcast announcer who did voiceovers for national commercials, and who later wound up founding Weigel Broadcasting; while his mother, Virginia Ahn, had been a big-band singer with Tommy Dorsey.
Split into simpler sentences: His father was John Weigel, a broadcast announcer who did voiceovers for national commercials and who founded Weigel Broadcasting. His mother, Virginia Ahn, had been a big-band singer with Tommy Dorsey.