Complex sentence: The diocese covers the County of Gloucestershire and part of the County of Worcestershire and has its see in the City of Gloucester where the seat is located at the Cathedral Church of the Holy and Indivisible Trinity.
Split into simpler sentences: The diocese covers the County of Gloucestershire and part of the County of Worcestershire. The see's centre of governance is the City of Gloucester where the bishop's chair ("cathedra") is located in the Cathedral Church of the Holy and Indivisible Trinity.