( Quarks ( ( are ( ( particles out ) ( ( of which ) ( ( ( protons and ) neutrons ) ( are formed ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Quarks)) (VP (VBP are) (ADJP (ADJP (JJ particles) (IN out)) (SBAR (WHPP (IN of) (WHNP (WDT which))) (S (NP (NNS protons) (CC and) (NNS neutrons)) (VP (VBP are) (VP (VBN formed))))))) (. .)))
Quarks are particles out of which protons and neutrons are formed.
(ROOT (S (NP (NNS Protons) (CC and) (NNS neutrons)) (VP (VBP are) (VP (VBN made) (PP (IN of) (NP (NP (NNS quarks)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (NP (NP (JJ fundamental) (NNS particles)) (PP (IN of) (NP (NN matter))))))))))) (. .)))