( ( To ( make this ) ) ( , ( ( pure ( uranium oxide ) ) ( ( is ( ( ( ( treated first ) ( with ( hydrogen ( , ( then ( dry ( hydrogen fluoride ) ) ) ) ) ) ) and ) ( finally ( with ( elemental fluorine ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (TO To) (VP (VB make) (NP (DT this))))) (, ,) (NP (JJ pure) (NN uranium) (NN oxide)) (VP (VBZ is) (VP (VP (VBN treated) (ADVP (RB first)) (PP (IN with) (NP (NN hydrogen) (, ,) (RB then) (JJ dry) (NN hydrogen) (NN fluoride)))) (CC and) (VP (ADVP (RB finally)) (PP (IN with) (NP (JJ elemental) (NN fluorine)))))) (. .)))
To make this, pure uranium oxide is treated first with hydrogen, then dry hydrogen fluoride and finally with elemental fluorine.
(ROOT (S (NP (NNP Water)) (VP (VBZ is) (NP (NP (DT an) (NN oxide)) (PP (IN of) (NP (NN hydrogen))))) (. .)))