( ( ( The ( power ( ( output and ) efficiency ) ) ) ( of breathing ) ) . )
(ROOT (NP (NP (DT The) (NN power) (NN output) (CC and) (NN efficiency)) (PP (IN of) (NP (NN breathing))) (. .)))
The power output and efficiency of breathing.
(ROOT (S (NP (NNP Efficiency)) (VP (VBZ equals) (NP (NP (DT the) (NN output) (NN power)) (VP (VBN divided) (PP (IN by) (NP (DT the) (NN input) (NN power)))))) (. .)))