( ( An antifreeze ) ( ( is ( ( an additive ) ( which ( lowers ( ( the ( freezing point ) ) ( of ( a ( water-based liquid ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN antifreeze)) (VP (VBZ is) (NP (NP (DT an) (NN additive)) (SBAR (WHNP (WDT which)) (S (VP (VBZ lowers) (NP (NP (DT the) (JJ freezing) (NN point)) (PP (IN of) (NP (DT a) (JJ water-based) (NN liquid))))))))) (. .)))
An antifreeze is an additive which lowers the freezing point of a water-based liquid.
(ROOT (S (NP (NNP Antifreeze)) (VP (VBZ lowers) (S (NP (PRP it)) (NP (NP (DT the) (JJ freezing) (NN temperature)) (PP (IN of) (NP (NP (DT the) (NN water)) (PP (IN in) (NP (NN car) (NNS radiators)))))))) (. .)))