( ( ( One ( hundred degrees ) ) Celsius ) ( ( is ( ( the temperature ) ( ( at which ) ( water ( boils ( at ( sea level ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD One) (CD hundred) (NNS degrees)) (NP (NNP Celsius))) (VP (VBZ is) (NP (NP (DT the) (NN temperature)) (SBAR (WHPP (IN at) (WHNP (WDT which))) (S (NP (NN water)) (VP (VBZ boils) (PP (IN at) (NP (NN sea) (NN level)))))))) (. .)))
One hundred degrees Celsius is the temperature at which water boils at sea level.
(ROOT (S (PP (IN In) (NP (NNS celsius))) (, ,) (NP (NP (DT the) (JJ boiling) (NN point)) (PP (IN of) (NP (NN water)))) (VP (VBZ is) (NP (QP (CD one) (CD hundred)) (NNS degrees))) (. .)))