Complex sentence: Collegiate churches were often supported by (extensive) lands held by the church, or by tithe income from appropriated benefices, and commonly provide distinct spaces respectively for parochial worship, and for the choir offices of their clerical community.
Split into simpler sentences: Collegiate churches were often supported by (extensive) lands held by the church, or by tithe income from appropriated benefices. They commonly provide distinct spaces respectively for parochial worship, and for the choir offices of their clerical community.