Complex sentence: The previous building (designed by Martin & Hall), a yellow brick building with a peaked roof (under which was the study hall), was considerably smaller and was bounded by Pond Street which was consumed in the creation of the new campus.
Split into simpler sentences: The previous building, designed by Martin & Hall, was a yellow brick building with a peaked roof (under which was the study hall). It was considerably smaller and was bounded by Pond Street, which was consumed in the creation of the new campus.