( And ( ( ( ( his ( primary focus ) ) ( of attack ) ) ( in ( on ( ( the ( frontal lobes ) ) ( of ( the brain ) ) ) ) ) ) . ) )
(ROOT (FRAG (CC And) (NP (NP (PRP$ his) (JJ primary) (NN focus)) (PP (IN of) (NP (NN attack))) (PP (IN in) (PP (IN on) (NP (NP (DT the) (JJ frontal) (NNS lobes)) (PP (IN of) (NP (DT the) (NN brain))))))) (. .)))
And his primary focus of attack in on  the frontal lobes of the brain.
(ROOT (S (NP (DT The) (JJ primary) (NN motor) (NN cortex)) (VP (VBZ is) (VP (VBN located) (PP (IN in) (NP (NP (DT the) (JJ frontal) (NN lobe)) (PP (IN of) (NP (DT the) (NN brain))))))) (. .)))
The primary motor cortex is located in the frontal lobe of the brain.