( ( The ( class series ) ) ( ( is ( repeated ( at ( ( the end ) ( of ( each cycle ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN class) (NN series)) (VP (VBZ is) (VP (VBN repeated) (PP (IN at) (NP (NP (DT the) (NN end)) (PP (IN of) (NP (DT each) (NN cycle))))))) (. .)))
The class series is repeated at the end of each cycle.
(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.