( ( An ( important observation ) ) ( ( was ( ( ( the presence ) ( of ( numerous ( brain macrophages ) ) ) ) ( that ( participated ( in ( phagocytosis ( of ( damaged ( cellular elements ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (JJ important) (NN observation)) (VP (VBD was) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (JJ numerous) (NN brain) (NNS macrophages))) (SBAR (WHNP (WDT that)) (S (VP (VBD participated) (PP (IN in) (NP (NP (NNS phagocytosis)) (PP (IN of) (NP (VBN damaged) (JJ cellular) (NNS elements)))))))))) (. .)))
An important observation was the presence of numerous brain macrophages that participated in phagocytosis of damaged cellular elements.
(ROOT (S (NP (NNS Phagocytosis)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (JJ cellular) (NN eating))))) (. .)))