Questions about Past Perfect tense

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Use of Past Simple vs Past perfect in sentences with since

Ann admitted that she hadn't seen her parents since she left London. Is the above sentence OK or do I have to write Ann admitted that she hadn't seen her parents since she had left London. ...
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How to list down actions that are done in the past and are still being done in the present?

Which is more correct? "I have conquered sleepless nights, have studied various topics, have participated in extra-curricular activities, and have juggled my time for school and home duties" ...