Complex sentence: The Math team at Manchester Essex is a part of the Massachusetts Mathematics League and has been around since the 1970's serving as an outlet for students interested in mathematics who want to try very challenging problems in a competitive setting.
Split into simpler sentences: The Math team at Manchester Essex is a part of the Massachusetts Mathematics League and has been active since the 1970's. The team serves as an outlet for students interested in mathematics by offering challenging problems in a competitive setting.