Complex sentence: Composite monarchies were common during the early 1400s to mid 1500s used to strengthen kingdoms or countries, new rulers adapted to a country's rules and accept diversity to maintain peace by not changing the status quo of its habitants.
Split into simpler sentences: Composite monarchies were common during the early 1400s to mid 1500s. New rulers were expected to adapt to a country's rules and accept diversity to maintain peace by not changing the status quo of its habitants.