Complex sentence: In his testimony, Cosby admitted to casual sex, involving use of Quaaludes, with a series of young women, including an admission that his use of drugs in the 1970s was illegal.
Split into simpler sentences: In his testimony, Cosby admitted that he engaged in casual sex with a series of young women; he also testified that the encounters involved use of the sedative Quaaludes. Cosby also admitted that his use of drugs in the 1970s was illegal.