
Mary M. answered 05/08/19
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Her sister, Elizabeth, ascended the throne, later defeating Philip's Spanish Armada contains the subject sister/Elizabeth, the verb ascended, and the phrase 'later defeating Philip's Spanish Armada' is a participial phrase that gives further description to the subject, sister/Elizabeth.or modifies her later rule after defeating the Armada.
By the same token, if the sentence is worded in the same way you noted, 'and later defeated', the subject is sister/Elizabeth, the compound verbs would be 'ascended' and 'defeated' if you diagrammed the sentence. (Later would be describing when she defeated the Armada).
It depends how you phrase the compound or complex sentence.