Simplify the following text for a Grade 6 native English-speaking person.
Original: The J. League Division 2 or J2 League is the second division of Japan Professional Football League and is the second-tier professional association football league in Japan . Currently , J. League Division 2 is the second level of the Japanese association football league system .
Simplified: J. League Division 2 is a football league which is second division in Japan .