Complex sentence: The two shared a mutual admiration as they both dealt with such controversial subjects as race and sexuality, with Stern since recognizing him as an influence, calling him a "broadcasting genius" in his book "Private Parts".
Split into simpler sentences: The two shared a mutual admiration as they both dealt with such controversial subjects as race and sexuality, with Stern since recognizing him as an influence. Stern later called him a "broadcasting genius" in his book "Private Parts".