Technological advances generally come in waves that crest and eventually subside.
( ( Technological advances ) ( generally ( ( ( ( come in ) waves ) ( ( ( ( that crest ) and ) eventually ) subside ) ) . ) ) )
(ROOT (S (NP (JJ Technological) (NNS advances)) (ADVP (RB generally)) (VP (VBP come) (PRT (RP in)) (NP (NNS waves)) (NP (NP (DT that) (NN crest)) (CC and) (ADVP (RB eventually)) (NP (NN subside)))) (. .)))
Advances in technology usually ebb and flow.
( ( Advances ( in technology ) ) ( usually ( ( ( ebb and ) flow ) . ) ) )
(ROOT (S (NP (NP (NNS Advances)) (PP (IN in) (NP (NN technology)))) (ADVP (RB usually)) (VP (VB ebb) (CC and) (VB flow)) (. .)))