Complex sentence: He is buried in the St Symphorien military cemetery, just southwest of Mons, which coincidentally is also the final resting place of John Parr, the first British soldier killed during the Great War.
Split into simpler sentences: He is buried in the St Symphorien military cemetery, just southwest of Mons. Coincidentally, St. Sympohorien is also the final resting place of John Parr, the first British soldier killed during the Great War.