Complex sentence: Many of the critics of British rule in the British colonies in North America argued that their traditional rights as Englishmen were being violated, which subsequently became one of the original primary justifications for the American Revolution of 1775 and the resulting separation from the British Empire.
Split into simpler sentences: Many of the colonists that objected to British rule in the British colonies in North America argued that their traditional rights as Englishmen were being violated. This subsequently became one of the original primary justifications for the American Revolution of 1775 and the resulting separation of the colonies from the British Empire.