Complex sentence: Gut loading is considered most important if the primary source of nutrition is from insects, especially crickets, because crickets are lower in nutritional value than other common insects fed, such as meal worms and wax worms.
Split into simpler sentences: Gut loading is considered most important if the primary source of nutrition is from insects, especially crickets. Because crickets are lower in nutritional value than other common insects fed, such as meal worms and wax worms.