\\ How \\, how come?
( ( ( \ \ ) ( How ( \ \ ) ) ) ( , ( ( how come ) ? ) ) )
(ROOT (SBARQ (FRAG (NP (NNP \) (NNP \)) (WHADJP (WRB How) (ADJP (RB \) (JJ \)))) (, ,) (SBARQ (WHADVP (WRB how)) (SQ (VP (VBP come)))) (. ?)))
How did you do it, and how come you even wanted to? 
( How ( ( ( did you ) ( ( ( ( ( do it ) , ) and ) how ) ( come ( you ( even ( wanted to ) ) ) ) ) ) ? ) )
(ROOT (SBARQ (WHADVP (WRB How)) (SQ (VBD did) (NP (PRP you)) (VP (VP (VB do) (NP (PRP it))) (, ,) (CC and) (ADVP (WRB how)) (VP (VB come) (SBAR (S (NP (PRP you)) (ADVP (RB even)) (VP (VBD wanted) (PP (TO to)))))))) (. ?)))