Simplify the following text for a Grade 8 native English-speaking person.
Original: The Royal Union Flag is also an official flag in Canada , used as a symbol of Canada 's membership in the Commonwealth of Nations , and of its allegiance to the Crown .
Simplified: On some days the Canadian government flies the Royal Union Flag next to the Maple Leaf Flag . The Royal Union Flag is the British Union Jack , and is a symbol that Canada is a member of the Commonwealth , and that Canada and Britain share a history and a monarch .