Complex sentence: Mahendran refused to direct the film if Rajinikanth was not cast, and Chettiar capitulated; however, he was still unhappy with the director's decision and called it "ridiculous" and "preposterous" every time he visited the set.
Split into simpler sentences: Mahendran refused to direct the film if Rajinikanth was not cast, and Chettiar capitulated. He was still unhappy with the director's decision and called it "ridiculous" and "preposterous" every time he visited the set.