Complex sentence: In 1571, Elizabeth I, a great believer in colonization, granted Smith of East Ulster to plant English settlers in an effort to seize control of the Clandeboye O’Neill territory and control the native Irish.
Split into simpler sentences: In 1571, Elizabeth I, a great believer in colonization, granted Smith of East Ulster. The empty lands were to be used to to plant English settlers in an effort to control areas claimed by Clandeboye O’Neill territory and thus control the native Irish.