Complex sentence: Food for fancy mice can range from specially formulated feed mix to kitchen scraps, carrots spinach tomato lettuce and is usually very inexpensive, although the latter should be applied sparingly as it may not provide a balanced diet.
Split into simpler sentences: Food for fancy mice can range from specially formulated feed mix to kitchen scraps. Carrot, spinach, tomato, and lettuce are usually very inexpensive, although the latter should be applied sparingly as it may not provide a balanced diet.