Complex sentence: The 33rd Queen Victoria's Own had remained in India during the war but they were sent into Mesopotamia to counter Turkish advances and to protact the oil fields they would be involved in the Battle of Shaiba and the Battle of Ctesiphon.
Split into simpler sentences: The 33rd Queen Victoria's Own had remained in India during the war but they were sent into Mesopotamia to counter Turkish advances and to protect the oil fields. They were involved in the Battle of Shaiba and the Battle of Ctesiphon.