Complex sentence: At age 5, his chess talent was discovered in an after school chess program at Congregation Beth Elohim in Park Slope, Brooklyn, and he played his first tournament at the Polgar Chess Center in Queens, New York.
Split into simpler sentences: At age 5, his chess talent was discovered in an after school chess program at Congregation Beth Elohim in Park Slope, Brooklyn. That same year he played his first tournament at the Polgar Chess Center in Queens, New York.