Complex sentence: Later in 1595 O'Neill and O'Donnell wrote to King Philip II of Spain for help, offered to be his vassals and proposed that his cousin Archduke Albert be made Prince of Ireland, but nothing came of this.
Split into simpler sentences: Later in 1595 O'Neill and O'Donnell wrote to King Philip II of Spain for help, offered to be his vassals. He also proposed that his cousin Archduke Albert be made Prince of Ireland, but nothing came of this.