Complex sentence: In the modern troubles this flashpoint became the source of rioting between the Catholics of the Tunnel area and Protestants from neighbouring Edgarstown, often exacerbated by men from other areas within the town reinforcing the numbers on either side.
Split into simpler sentences: In the modern troubles this flashpoint became the source of rioting between the Catholics of the Tunnel area and Protestants from neighbouring Edgarstown. Often exacerbated by men from other areas within the town reinforcing the numbers on either side.