( There ( ( are ( ( ( six leptons ) , ) ( ( three ( of which ) ) ( have ( ( ( electrical charge ) and ) ( ( three ( of which ) ) ( do not ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD six) (NNS leptons)) (, ,) (SBAR (WHNP (CD three) (WHPP (IN of) (WHNP (WDT which)))) (S (VP (VBP have) (NP (NP (JJ electrical) (NN charge)) (CC and) (SBAR (WHNP (CD three) (WHPP (IN of) (WHNP (WDT which)))) (S (VP (VBP do) (RB not)))))))))) (. .)))
There are six leptons, three of which have electrical charge and three of which do not.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD six) (NNS types)) (PP (IN of) (NP (NNS leptons))))) (. .)))