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''The doctor determined the cause of Gina's health problem.'' is a simple sentence.
A simple sentence consists of only one clause having only one subject, the predicate. It may or may not contain an object.
In the given sentence, there is a subject 'the doctor,' a predicate "cause" and an object "cause of Gina's health problem."
On the other hand, compound sentence consists of more than two independent clauses.
An independent clause has a proper meaning and it makes sense without the other clause.
These independent clauses are joined together using a conjunction such as: yet, nor, for, so, and, but & many more.
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Derict object is what you are looking for
True. Maybe because you can follow it
-(after the sentence.) Cassie and Ben have fulfilled their sacred mission of saving Sammy, the aliens' main military base has been blown to bits, and Cassie and the gang are headed off to relative safety.
the story ended because of the hard work or skill. cassie and Ben, other characters worked hard to save "humanity" or what's left.
Working hard irl is most important because that's how you can get things you want/need to succeed.
(I dont know if that answer is okay, but there?^)