( Overall ( , ( ( ( low ( wave energy ) ) ( in ( these lakes ) ) ) ( ( means ( that ( beaches ( rarely form ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Overall)) (, ,) (NP (NP (JJ low) (NN wave) (NN energy)) (PP (IN in) (NP (DT these) (NNS lakes)))) (VP (VBZ means) (SBAR (IN that) (S (NP (NNS beaches)) (ADVP (RB rarely)) (VP (VBP form))))) (. .)))
Overall, low wave energy in these lakes means that beaches rarely form.
(ROOT (S (NP (NNP Low) (NN energy)) (VP (VBZ causes) (S (NP (NNS waves)) (VP (TO to) (VP (VB bring) (NP (NN sand)) (PRT (RP up)) (PP (IN onto) (NP (NP (DT the) (NN beach)) (PP (IN during) (NP (NNS summers))))))))) (. .)))