Original sentence: Its correct use is now restricted to only a few Great Officers who officially represent The Sovereign, and flies above Royal Residences in Scotland when they are not in residence, since there is no monarch of Scotland due to the break of the Union in the mid 18th century and as revised in the act of Union in 1801
Edited sentence: Its correct use is now restricted to only a few Great Officers who officially represent The Sovereign, and flies above Royal Residences in Scotland since there is no monarch of Scotland due to the break of the Union in the mid 18th century and as revised in the act of Union in 1801