Complex sentence: While in Tulsa, Phillips built several office complexes, such as the Philtower and Philcade, as well as his mansion, the 72-room Italian Renaissance-style Villa Philbrook.
Split into simpler sentences: While in Tulsa, Phillips built several office complexes, such as the Philtower and Philcade. He also ha a mansion built, the 72-room Italian Renaissance-style Villa Philbrook.