Complex sentence: It included two Naval Brigades and a brigade of Royal Marines, and fought in the defence of Antwerp in 1914, the Battle of Gallipoli in 1915, and the Battle of the Somme in 1916.
Split into simpler sentences: It included two Naval Brigades, and a brigade of Royal Marines. It fought in the defence of Antwerp in 1914, in the Battle of Gallipoli in 1915, and in the Battle of the Somme in 1916.