While parents may pick up this gay semaphore, kids aren't likely to.
( ( While ( parents ( may ( ( pick up ) ( this ( gay semaphore ) ) ) ) ) ) ( , ( kids ( ( ( are n't ) ( likely to ) ) . ) ) ) )
(ROOT (S (SBAR (IN While) (S (NP (NNS parents)) (VP (MD may) (VP (VB pick) (PRT (RP up)) (NP (DT this) (JJ gay) (NN semaphore)))))) (, ,) (NP (NNS kids)) (VP (VBP are) (RB n't) (ADJP (JJ likely) (PP (TO to)))) (. .)))
Kids aren't likely to recognize gay signals, but some parents do. 
( ( ( ( ( Kids ( ( are n't ) ( likely ( to ( recognize ( gay signals ) ) ) ) ) ) , ) but ) ( ( some parents ) do ) ) . )
(ROOT (S (S (NP (NNP Kids)) (VP (VBP are) (RB n't) (ADJP (JJ likely) (S (VP (TO to) (VP (VB recognize) (NP (JJ gay) (NNS signals)))))))) (, ,) (CC but) (S (NP (DT some) (NNS parents)) (VP (VBP do))) (. .)))