Simplify the following text for a Grade 8 native English-speaking person.
Original: In professional wrestling , a battle royal ( sometimes battle royale ; plural battles royal or battle royals ) is a multi-competitor match type in which wrestlers are eliminated until one is left and declared winner .
Simplified: In professional wrestling , a battle royal ( sometimes spelled battle royale ; plural battles royal or battle royals ) is a match type in which many wrestlers fight against each other at the same time and wrestlers are eliminated until only one is left . That person is then the winner .