Original sentence: The idea of replacing the pound with the euro has been controversial with some sectors of the British public because of its identity as a symbol of British nationalism and because it would, according to some critics, lead to suboptimal interest rates, harming the British economy
Edited sentence: The idea of replacing the pound with the euro has been controversial with some sectors of the British public because of its identity as a symbol of British nationalism and, more importantly, because it would lead to suboptimal interest rates, harming the British economy