Complex sentence: The club claims to be one of the oldest rugby clubs in Australia and traces its roots back to 1887, when the "Past & Present Grammar Club" was formed from teachers, students, and past students of the Brisbane Grammar School (BGS).
Split into simpler sentences: The club claims to be one of the oldest rugby clubs in Australia and traces its roots back to 1887, when the Past & Present Grammar Club was formed. The original players were teachers, students, and past students of Brisbane Grammar School (BGS).