Complex sentence: With the outbreak of World War I in August 1914 the Healy brothers supported the Allied and British war effort, two had a son enlist in one of the Irish divisions, Timothy's eldest son, Joe, fought with distinction at Gallipoli.
Split into simpler sentences: With the outbreak of World War I in August 1914, the Healy brothers supported the Allied and British war effort. Two had a son enlist in one of the Irish divisions, Timothy's eldest son, Joe, fought with distinction at Gallipoli.