In Mumbai, both Juhu and Chowpatty beaches are, for instance, definitely a bad idea, and though the Marina beaches in Chennai are cleaner, there may be sharks.
( ( In Mumbai ) ( , ( ( ( ( ( ( both ( Juhu ( and ( Chowpatty beaches ) ) ) ) ( ( ( ( are , ) ( for instance ) ) , ) ( definitely ( a ( bad idea ) ) ) ) ) , ) and ) ( ( though ( ( ( the ( Marina beaches ) ) ( in Chennai ) ) ( are cleaner ) ) ) ( , ( there ( may ( be sharks ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (NNP Mumbai))) (, ,) (S (NP (DT both) (NNP Juhu) (CC and) (NNP Chowpatty) (NNS beaches)) (VP (VBP are) (, ,) (PP (IN for) (NP (NN instance))) (, ,) (VP (VBG definitely) (NP (DT a) (JJ bad) (NN idea))))) (, ,) (CC and) (S (SBAR (IN though) (S (NP (NP (DT the) (NNP Marina) (NNS beaches)) (PP (IN in) (NP (NNP Chennai)))) (VP (VBP are) (ADJP (JJR cleaner))))) (, ,) (NP (EX there)) (VP (MD may) (VP (VB be) (NP (NNS sharks))))) (. .)))
The beaches in Mumbai are a bad idea.
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(ROOT (S (NP (NP (DT The) (NNS beaches)) (PP (IN in) (NP (NNP Mumbai)))) (VP (VBP are) (NP (DT a) (JJ bad) (NN idea))) (. .)))