Complex sentence: Silicon is an essential element in biology, although only tiny traces of it appear to be required by animals, however various sea sponges as well as microorganisms like diatoms need silicon in order to have structure.
Split into simpler sentences: Silicon is an essential element in biology, although only tiny traces of it appear to be required by animals. However various sea sponges as well as microorganisms like diatoms need silicon in order to have structure.