Complex sentence: Flies in the Dipteran order undergo what is known as holometabolous transformation, a type of metabolic transformation in which an insect starts out as an egg, undergoes larval stages, and then pupates before reaching full adulthood.
Split into simpler sentences: Flies in the Dipteran order go through what is known as holometabolous transformation. Holometabolous transformation is a type of metabolic transformation in which an insect starts out as an egg, undergoes larval stages, and then pupates before reaching full adulthood.