Complex sentence: Late in 1914 this civilised life was exchanged for the trenches of France near Ypres, but it was here that he wrote his first poetry- "Some instinct, and a combination of feelings not hitherto experienced united to drive me to paper".
Split into simpler sentences: Late in 1914 this civilised life was exchanged for the trenches of France near Ypres. It was here that he wrote his first poetry-- "Some instinct, and a combination of feelings not hitherto experienced united to drive me to paper".