( ( Such ( a volume ) ) ( ( is ( called ( ( ( ( an ( electronic orbital ) ) or ) simply ) ( an orbital ) ) ) ) . ) )
(ROOT (S (NP (PDT Such) (DT a) (NN volume)) (VP (VBZ is) (VP (VBN called) (NP (NP (DT an) (JJ electronic) (NN orbital)) (CC or) (ADVP (RB simply)) (NP (DT an) (NN orbital))))) (. .)))
Such a volume is called an electronic orbital or simply an orbital.
(ROOT (S (NP (DT The) (NN orbital)) (VP (VBZ is) (NP (NP (DT the) (NN region)) (VP (VBN called) (SBAR (WHADVP (WRB where)) (S (NP (DT an) (NN electron)) (VP (VBZ is) (ADJP (RBS most) (JJ likely) (S (VP (TO to) (VP (VB be) (VP (VBN found)))))))))))) (. .)))