( ( ( ( ( ( Soil 's ) ( organic material ) ) , ) ( called humus ) ) , ) ( ( is ( formed ( from ( ( the decay ) ( of ( ( plants and ) animals ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Soil) (POS 's)) (JJ organic) (NN material)) (, ,) (VP (VBN called) (NP (NNS humus))) (, ,)) (VP (VBZ is) (VP (VBN formed) (PP (IN from) (NP (NP (DT the) (NN decay)) (PP (IN of) (NP (NNS plants) (CC and) (NNS animals))))))) (. .)))
Soil's organic material, called humus, is formed from the decay of plants and animals.
(ROOT (S (NP (NP (DT The) (JJ decayed) (NNS remains)) (PP (IN of) (NP (VBG living) (NNS organisms)))) (VP (VBZ is) (VP (VBN called) (NP (NNS humus)))) (. .)))