Complex sentence: While his legal ability was not in dispute, he had made numerous enemies: in politics he was generally seen as a Tory at a time when the Whigs were dominant, and in 1693 he was openly accused of being a Jacobite.
Split into simpler sentences: While his legal ability was not in dispute, he had made numerous enemies. In politics he was generally seen as a Tory at a time when the Whigs were dominant, and in 1693 he was openly accused of being a Jacobite.