Evolution does not contradict the second law of thermodynamics, anymore than geo-stationary satellites contradict the laws of gravity. The apparent decrease in entropy (disorder) represented by a living organism is paid-for by an increase in entropy elsewhere (e.g. all your discarded pizza boxes). You are considering the organism in isolation, but in reality it is always having an impact on its environment which is on a relentless path towards disorder.
The decay of your dead body is not the pay-back for your loan from chaos, more like it is the death of those that gave their lives to feed you for 80 years (yuk this is morbid! - but true)
And when you die, yes, your components will be usuful to other life but not neccessarily for the better.
Coincidently, we have a way to measure entropy. How do you measure complexity?
Kolmogorov complexity is one method whereby the measure is the minimum number of bits into which a binary representation of the object can be compressed without losing information.