Complex sentence: In 1605 James Hamilton and Sir Hugh Montgomery where given grants by James I in eastern Ulster, under which they were tasked with settling their lands with English and Scottish Protestants, a task that they both undertook with "considerable determination".
Split into simpler sentences: In 1605 James Hamilton and Sir Hugh Montgomery where given grants by James I in eastern Ulster. Under the terms of these grants, they had to settle their lands with English and Scottish Protestants, a task that they both undertook with "considerable determination".