Complex sentence: It will be the thirty-first event under the Royal Rumble chronology and the first-ever Royal Rumble event to feature an all-women Royal Rumble match alongside the traditional men's Royal Rumble match.
Split into simpler sentences: It will be the thirty-first event under the Royal Rumble chronology. This will be the first-ever Royal Rumble event to feature an all-women Royal Rumble match alongside the traditional men's Royal Rumble match.