Simplify the following text for a Grade 9 native English-speaking person.
Original: Some take this period as the establishment of separate colonies , but that did not officially occur until 1729 , when seven of the Lords Proprietors sold their interests in Carolina to The Crown , and both North Carolina and South Carolina became royal colonies .
Simplified: An argument over how the it would be governed led to its becoming the Province of North Carolina and the Province of South Carolina . Officially , these two provinces did not become separate colonies until 1729 .