Complex sentence: McKeehan took the song's title from the derogatory 1970s term "Jesus freak" and turned it on its head; he noted that when he was looking up the word "freak" in the dictionary, he saw an entry that said "ardent enthusiast".
Split into simpler sentences: McKeehan took the songs title from the derogatory 1970s term "Jesus freak" and turned it on its head. McKeehan said that when he was looking up the word "freak" in the dictionary, he saw an entry that said "ardent enthusiast".