Parallelism Answer 15

15. Touissant L'Ouverture and George Washington wanted to know how they became the fathers of their countries and how they were able to do so without anybody's help.

This is a case of a compound noun clause.The signal word ["how"] for the second noun clause ["they were able to do so without anybody's help"] has been left out. It should be reinstated to make a sentence that makes the most sense. If it is left out, it would appear (like #10 above) that the second noun clause is masquerading as an independent clause which should be set off with a comma before the "and". If, indeed, this were the case, then the meaning of the sentence would be dramaticall changed.