Complex sentence: Anticipating further problems with vestments, Thomas Sampson corresponded with Peter Martyr Vermigli on the matter whose opinion, along with Bullinger's, was to accept them but also to preach against them.
Split into simpler sentences: Anticipating further problems with vestments, Thomas Sampson corresponded with Peter Martyr Vermigli on the matter. Martyr's advice, along with Bullinger's, was to accept vestments but also to preach against them.