"Creatures evolve to greater complexity":
Not necessarily so. It's a general trend, but adaptation is not always the same as sophistication.
"A human being is a collection of smaller life forms":
Not true at all by current definitions of the words "human being" or "life forms".
"Unused structures remain latent within the genetic coding and may be re-expressed at a later date":
Yes, this needs clarification. It sounds pretty wrong to me, given the mechanisms of selection.
"people are highly specialised worms":
No, people are not worms of any kind. Worms are worms. Tell us who said that so we may mock them heartily.
"It is the most foolish thing to think of a person as an individual organism because we can not synthesize sunlight directly, therefore are at best symbiotic":
Whoever said that doesn't understand what an individual is.