( Thus ( spores ( ( are ( part ( of ( the ( sexual ( reproduction cycle ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Thus)) (NP (NNS spores)) (VP (VBP are) (NP (NP (NN part)) (PP (IN of) (NP (DT the) (JJ sexual) (NN reproduction) (NN cycle))))) (. .)))
Thus spores are part of the sexual reproduction cycle.
(ROOT (S (NP (NNS Spores)) (VP (VBP are) (ADVP (RB generally)) (VP (VBN produced) (PP (IN through) (NP (JJ sexual) (NN reproduction))))) (. .)))