Complex sentence: In 1861, Britain signed another treaty with Bahrain, the Perpetual Truce of Peace and Friendship; the ruler of Bahrain was not to engage in "prosecution of war, piracy and slavery at sea" and Britain was to provide protection.
Split into simpler sentences: In 1861, Britain signed another treaty with Bahrain, the Perpetual Truce of Peace and Friendship. The ruler of Bahrain was not to engage in "prosecution of war, piracy and slavery at sea" and Britain was to provide protection.