Complex sentence: Count Raymond VI, Count of Toulouse refused to assist, and openly supported the Cathars and their independent movement, so he was excommunicated in May 1207 and an interdict was placed on his lands.
Split into simpler sentences: Count Raymond VI, Count of Toulouse refused to assist, and openly supported the Cathars and their independence movement. He was excommunicated in May 1207 and an interdict was placed on his lands.