( ( ( This ( repeated ( ( ( hot and ) cold ) cycling ) ) ) ( of water ) ) ( ( was ( the ( vital procedure ) ) ) . ) )
(ROOT (S (NP (NP (DT This) (VBN repeated) (ADJP (JJ hot) (CC and) (JJ cold)) (NN cycling)) (PP (IN of) (NP (NN water)))) (VP (VBD was) (NP (DT the) (JJ vital) (NN procedure))) (. .)))
This repeated hot and cold cycling of water was the vital procedure.
(ROOT (S (NP (DT The) (NN water) (NN cycle)) (VP (VBZ ends) (SBAR (IN with) (S (NP (PRP it)) (VP (VBZ repeats) (NP (PRP itself)))))) (. .)))
The water cycle ends with it repeats itself.