Complex sentence: Ngee Ann Kongsi's wholly owned divisions (Ngee Ann Property & Management Pte. Ltd. and Ngee Ann Development Pte. Ltd.) are both housed within Ngee Ann City's Tower A, whereas Ngee Ann Kongsi, Ngee Ann Education Holdings Pte.
Split into simpler sentences: Ngee Ann Kongsi's wholly owned divisions are Ngee Ann Property & Management Pte. Ltd., both housed within Ngee Ann City's Tower A. Whereas Ngee Ann Kongsi, Ngee Ann Education Holdings Pte.