Complex sentence: R.A.B. is not involved with Manischewitz wine, however, except in name: it has, since 1986, licensed the Manischewitz brand name to the Manischewitz Wine Company, a subsidiary of Canandaigua Wine Company (now Constellation Brands).
Split into simpler sentences: R.A.B. is not involved with Manischewitz wine, however, except in name. It has, since 1986, licensed the Manischewitz brand name to the Manischewitz Wine Company, a subsidiary of Canandaigua Wine Company (now Constellation Brands).