Complex sentence: The portrait had been covered from view and as the tally had reached a certain amount, a piece of the portrait would be revealed to the viewers until it was completely uncovered, revealing what George Fennel looked like.
Split into simpler sentences: The portrait had been covered from view and as the tally had reached a certain amount. A piece of the portrait would be revealed to the viewers until it was completely uncovered, revealing what George Fennel looked like.