Complex sentence: Both WTSX and WDLC-AM did rather well in terms of ratings and profitability through the 1980s, and later that decade, Oscar Wein retired and his son Bob Wein took over operations.
Split into simpler sentences: Both WTSX and WDLC-AM did well in terms of ratings and profitability through the 1980s. Later in that decade Oscar Wein retired and his son, Bob, took over operations.