Flies, in all stages of their life cycles, are an important food source for birds, reptiles, amphibians, fish, and other insects.
(Flies, in all stages of their life cycles; are; an important food source for birds, reptiles, amphibians, fish, and other insects)
Flies, in all stages of their life cycles
are
an important food source for birds, reptiles, amphibians, fish, and other insects