Complex sentence: By 1981, the Jacksons had regained success as a platinum-selling recording group with two albums, "Destiny" and "Triumph" and lead singer Michael Jackson was in the final stages of promoting his multi-platinum album, "Off the Wall".
Split into simpler sentences: By 1981, the Jacksons had regained success as a platinum-selling recording group with two albums, "Destiny" and "Triumph". Additionally, lead singer Michael Jackson was in the final stages of promoting his multi-platinum album, "Off the Wall".