( ( Radiation ( from ( the Sun ) ) ) ( ( is ( ( ( the ( ultimate source ) ) ( of ( energy ( for ( most communities ) ) ) ) ) ( of ( living things ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Radiation)) (PP (IN from) (NP (DT the) (NNP Sun)))) (VP (VBZ is) (NP (NP (DT the) (JJ ultimate) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN for) (NP (JJS most) (NNS communities))))) (PP (IN of) (NP (VBG living) (NNS things))))) (. .)))
Radiation from the Sun is the ultimate source of energy for most communities of living things.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (DT the) (NN energy)) (VP (VBN used) (PP (IN by) (NP (VBG living) (NNS things))))))) (VP (VBZ comes) (ADVP (CC either) (RB directly) (CC or) (RB indirectly)) (PP (IN from) (NP (DT the) (NN sun)))) (. .)))
Most of the energy used by living things comes either directly or indirectly from the sun.