Complex sentence: According to Dochev, he discovered Gately's body lying on a sofa as he was about to leave, waking Cowles, who had retired alone to his and Gately's bedroom.
Split into simpler sentences: According to Dochev, he discovered Gately's body lying on a sofa as he was about to leave. He woke Cowles, who had retired alone to his and Gately's bedroom.