Complex sentence: On May 15,2008, a spokesperson for Mercury Nashville announced that Twain and Lange were separating after Lange had an affair whilst still married, his personal attentions turned to Twain's best friend, Marie-Anne Thiebaud.
Split into simpler sentences: On May 15,2008, a spokesperson for Mercury Nashville announced that Twain and Lange were separating after Lange had an affair whilst still married. Lange's personal attentions then turned to Twain's best friend, Marie-Anne Thiebaud.