Complex sentence: The official ruling was that Reles died trying to climb down bedsheets to the street below; however, it was rumored that the Cosa Nostra raised $100,000 to bribe Reles's guards to shove him out the window.
Split into simpler sentences: The official ruling was that Reles died trying to climb down bedsheets to the street below. However, it was rumored that the Cosa Nostra raised $100,000 to bribe Reles's guards to shove him out the window.