Simplify the following text for a Grade 8 native English-speaking person.
Original: Madison Square Garden , often abbreviated as MSG and known colloquially as The Garden , is a multi-purpose indoor arena in the New York City borough of Manhattan and located at 8th Avenue , between 31st and 33rd Streets , situated on top of Pennsylvania Station .
Simplified: The Madison Square Garden ( frequently called The Garden or MSG ) is an indoor arena in New York City .