Complex sentence: Wilhelm (2008), 62--65 He found the New York Public Library, then being built, especially offensive and, according to Paul L. Montgomery, visited the architects' offices almost every day to shout at them.
Split into simpler sentences: Wilhelm (2008), 62--65 He found the New York Public Library, then being built, especially offensive. According to Paul L. Montgomery, Pound visited the architects' offices almost every day to shout at them.