Complex sentence: Summoned by the local clergy to protect their interests against the Proudies and Mr Slope is another clergyman, the brilliant Mr Arabin, who also falls in love with Eleanor, and she with him.
Split into simpler sentences: Summoned by the local clergy to protect their interests against the Proudies and Mr Slope is another clergyman, the brilliant Mr Arabin. He also falls in love with Eleanor, and she with him.