( ( As ( ( the light ) ( approached ( ( the underside ) ( of ( the ship ) ) ) ) ) ) ( , ( ( ( the ( craft 's ) ) luminescence ) ( ( revealed ( ( a creature ) ( holding ( ( the object ) ( which ( produced ( the ( light beam ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (DT the) (NN light)) (VP (VBD approached) (NP (NP (DT the) (NN underside)) (PP (IN of) (NP (DT the) (NN ship))))))) (, ,) (NP (NP (DT the) (NN craft) (POS 's)) (NN luminescence)) (VP (VBD revealed) (NP (NP (DT a) (NN creature)) (VP (VBG holding) (NP (NP (DT the) (NN object)) (SBAR (WHNP (WDT which)) (S (VP (VBD produced) (NP (DT the) (JJ light) (NN beam))))))))) (. .)))
As the light approached the underside of the ship, the craft's luminescence revealed a creature holding the object which produced the light beam.
(ROOT (S (NP (NP (NNP Producing) (NN light)) (PP (IN without) (NP (DT a) (JJ high) (NN temperature)))) (VP (VBZ is) (VP (VBN called) (S (ADJP (JJ luminescence))))) (. .)))