Complex sentence: A vegetarian diet excludes all animal flesh and slaughter by-products: a vegetarian eats no meat, poultry, game, fish, shellfish or crustacea and uses no by-products acquired through slaughter such as leather and fur.
Split into simpler sentences: A vegetarian diet excludes all animal flesh and slaughter by-products: a vegetarian would not eat any meat, poultry, game or fish, shellfish or crustacea. Furthermore, a vegetarian would not use any by-products acquired through slaughter, such as leather and fur.