Complex sentence: Most of the men buried at Regina Trench fell in battle between October 1916 and February 1917 and the original portion of the cemetery (now Plot II, Rows A to D) was established during the winter of 1916--1917.
Split into simpler sentences: Most of the men buried at Regina Trench fell in battle between October 1916 and February 1917. The original portion of the cemetery (Plot II, Rows A to D) was established during the winter of 1916--1917.