( ( When ( ( a ( ( rapidly moving ) particle ) ) ( collides ( with ( a ( gas atom ) ) ) ) ) ) ( , ( ( an electron ) ( ( is ( ( ( ejected ( from ( the atom ) ) ) , ) ( ( ( leaving ( a ( charged ion ) ) ) and ) ( ( ( making ( the gas ) ) electrically ) conductive ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT a) (ADJP (RB rapidly) (JJ moving)) (NN particle)) (VP (VBZ collides) (PP (IN with) (NP (DT a) (NN gas) (NN atom)))))) (, ,) (NP (DT an) (NN electron)) (VP (VBZ is) (VP (VBN ejected) (PP (IN from) (NP (DT the) (NN atom))) (, ,) (S (VP (VP (VBG leaving) (NP (DT a) (JJ charged) (NN ion))) (CC and) (VP (VBG making) (NP (DT the) (NN gas)) (ADVP (RB electrically)) (ADVP (RB conductive))))))) (. .)))
When a rapidly moving particle collides with a gas atom, an electron is ejected from the atom, leaving a charged ion and making the gas electrically conductive.
(ROOT (S (PP (IN Within) (NP (DT a) (NN substance))) (, ,) (NP (NP (NNS atoms)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP collide) (ADVP (RB frequently))) (CC and) (VP (VBP move) (ADVP (RB independently)) (PP (IN of) (NP (CD one) (DT another)))))))) (VP (VBP are) (ADJP (ADJP (RBS most) (JJ likely)) (PP (IN in) (NP (DT a) (NN gas)))))))