Complex sentence: Four of the six massive catalog distribution centers built by Montgomery Ward from 1921 to 1929 remain and three of these have been the focus of projects of adaptive reuse that have become perhaps the most tangible legacy of Montgomery Ward.
Split into simpler sentences: Four of the six massive catalog distribution centers built by Montgomery Ward from 1921 to 1929 remain. Three have been subject to renovations for adaptive reuse and the buildings are perhaps the most tangible legacy of Montgomery Ward.