Complex sentence: An open air marketplace visited by millions each year, first opened in 1957, at it's center a century-old Indian banyan tree with treehouse, waterfall, koi pond, and stage for free performances.
Split into simpler sentences: An open air marketplace first opened in 1957 and visited by millions each year. At it's center a century-old Indian banyan tree with treehouse, waterfall, koi pond, and stage for free performances.