Complex sentence: Williams has credited other comedians with having influenced and inspired him, including Jonathan Winters, Peter Sellers, Nichols and May, and Lenny Bruce, partly became use they attracted a more intellectual audience by using a higher level of wit.
Split into simpler sentences: Williams has credited other comedians with having influenced and inspired him, including Jonathan Winters, Peter Sellers, Nichols and May, and Lenny Bruce. He attributed their influence to their ability to attract a more intellectual audience by using a higher level of wit.