Complex sentence: In 1910, Eidlitz withdrew from the firm and with the addition of Stephen Voorhees and Paul Gmelin the firm reorganized as McKenzie, Voorhees & Gmelin.
Split into simpler sentences: In 1910, Eidlitz withdrew from the firm. Stephen F. Voorhees and Paul Gmelin, already with the firm became partners and Eidlitz and McKenzie was reorganized and renamed as McKenzie, Voorhees & Gmelin.