Complex sentence: The Osmond Brothers were regulars on the "Jerry Lewis Show" in 1969 and they continued to tour and perform with Andy Williams, but soon decided they wanted to perform popular music and shed their variety-show image.
Split into simpler sentences: The Osmond Brothers were regulars on the "Jerry Lewis Show" in 1969 and they continued to tour and perform with Andy Williams. But soon the Osmond Brothers decided they wanted to perform popular music and shed their variety-show image.