Complex sentence: Initially the firm built its reputation as a leading agent and advisor on shop property and acted for most of the major multiple retailers including Marks and Spencer, Tesco, British Home Stores, Boots, FW Woolworth, The John Lewis Partnership and numerous others.
Split into simpler sentences: Initially the firm built its reputation as a leading agent and advisor on shop property. It acted for most of the major multiple retailers including Marks and Spencer, Tesco, British Home Stores, Boots, FW Woolworth, The John Lewis Partnership and numerous others.