Complex sentence: SS "Gallia" was an transatlantic ocean liner converted into a troopship in 1915, torpedoed and sunk in the Mediterranean Sea on 4 October 1916 with great loss of life.
Split into simpler sentences: SS "Gallia" was an transatlantic ocean liner converted into a troopship in 1915. She was torpedoed and sunk in the Mediterranean Sea on 4 October 1916 with great loss of life.