Complex sentence: After the Latin Christian conquest of Jerusalem in 1099 during the First Crusade, the organisation became a religious and military order under its own Papal charter, and it was charged with the care and defence of the Holy Land.
Split into simpler sentences: After the Latin Christian conquest of Jerusalem in 1099 during the First Crusade, the organisation became a religious and military order under its own Papal charter. It as charged with the care and defence of the Holy Land.