Complex sentence: The brothers had a short run-in with each other in 2005; at the Royal Rumble, Undertaker was in a scheduled match against then-heel Heidenreich in a casket match.
Split into simpler sentences: The brothers had a short run-in with each other in 2005. At the Royal Rumble 2005, Undertaker was in a scheduled match against then-heel Heidenreich in a Casket Match.