Complex sentence: Although in 1099 Flambard was appointed Bishop of Durham, work continued under his successors, and by about 1150 there was a basic Norman church consisting of a nave, a central tower and a quire extending eastwards from the crossing.
Split into simpler sentences: Although in 1099 Flambard was appointed Bishop of Durham, work continued under his successors. By about 1150 there was a basic Norman church consisting of a nave, a central tower and a quire extending eastwards from the crossing.