Complex sentence: By 1984 he had contests running in over 20 cities and after submitting a show proposal went to work for Dick Clark Productions as consulting producer for the TV series "Puttin' on the Hits".
Split into simpler sentences: By 1984 he had contests running in over 20 cities. The contests became so popular he went to work for Dick Clark Productions as consulting producer for the TV series "Puttin' on the Hits".