Complex sentence: The importance of each of these food sources varies from species to species and family to family, for example of the two albatross species found in Hawaii, one, the Black-footed Albatross, takes mostly fish while the Laysan feeds on squid.
Split into simpler sentences: The importance of these food sources varies from species to species and family to family. For example, of the two albatross species found in Hawaii, the Black-footed Albatross takes mostly fish, while the Laysan feeds mainly on squid.