( ( ( The ( normal ( breathing rate ) ) ) ( for ( ( a horse ) ( at rest ) ) ) ) ( ( is ( ( 12-15 breaths ) ( per minute ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ normal) (NN breathing) (NN rate)) (PP (IN for) (NP (NP (DT a) (NN horse)) (PP (IN at) (NP (NN rest)))))) (VP (VBZ is) (NP (NP (CD 12-15) (NNS breaths)) (PP (IN per) (NP (NN minute))))) (. .)))
The normal breathing rate for a horse at rest is 12-15 breaths per minute.
(ROOT (S (NP (NP (DT The) (JJ normal) (NN respiratory) (NN rate)) (PP (IN per) (NP (NP (NN minute)) (PP (IN in) (NP (JJ adult) (NNS humans)))))) (VP (VBZ is) (NP (CD 12-18) (NNS breaths))) (. .)))