( ( The quarks ) ( ( are ( ( bound together ) ( by ( particles ( ( called gluons ) ( to ( ( make ( the ( common particles ) ) ) ( like ( ( protons and ) neutrons ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS quarks)) (VP (VBP are) (VP (VBN bound) (PRT (RP together)) (PP (IN by) (NP (NP (NNS particles)) (VP (VBN called) (NP (NNS gluons)) (S (VP (TO to) (VP (VB make) (NP (DT the) (JJ common) (NNS particles)) (PP (IN like) (NP (NNS protons) (CC and) (NNS neutrons))))))))))) (. .)))
The quarks are bound together by particles called gluons to make the common particles like protons and neutrons.
(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))))))))))) (. .)))