( ( The sun ) ( ( is ( ( ( the source ) ( of ( energy ( for ( most life ) ) ) ) ) ( on Earth ) ) ) . ) )
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (NP (NP (DT the) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN for) (NP (JJS most) (NN life))))) (PP (IN on) (NP (NNP Earth))))) (. .)))
The sun is the source of energy for most life on Earth.
(ROOT (S (ADVP (RB Ultimately)) (, ,) (NP (JJS most) (NN life) (NNS forms)) (VP (VBP get) (NP (PRP$ their) (NN energy)) (PP (IN from) (NP (DT the) (NN sun)))) (. .)))