( ( The electron ) ( then ( ( returns ( to ( ( its ( original orbit ) ) ( -LRB- ( ( drawn ( inward ( by ( ( the ( electrical attraction ) ) ( of ( the nucleus ) ) ) ) ) ) -RRB- ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NN electron)) (ADVP (RB then)) (VP (VBZ returns) (PP (TO to) (NP (NP (PRP$ its) (JJ original) (NN orbit)) (PRN (-LRB- -LRB-) (VP (VBN drawn) (S (VP (VBN inward) (PP (IN by) (NP (NP (DT the) (JJ electrical) (NN attraction)) (PP (IN of) (NP (DT the) (NN nucleus)))))))) (-RRB- -RRB-))))) (. .)))
The electron then returns to its original orbit  (drawn inward by the electrical attraction of the nucleus).
(ROOT (S (NP (NP (DT The) (NN electron)) (VP (VBN released) (PP (IN during) (NP (JJ beta) (NN decay))))) (VP (VBZ is) (RB not) (NP (NP (DT an) (JJ orbital) (NN electron)) (PP (CC but) (NP (NP (DT an) (NN electron)) (SBAR (WHNP (WP$ whose) (NNS origin)) (S (VP (VBD was) (PP (IN in) (NP (DT the) (NN nucleus)))))))))) (. .)))