( ( ( Concentrating ( on ( the ( first ( two years ) ) ) ) ) ( of ( ( combined studies ) ( on ( ( Sudden ( Unexpected Deaths ) ) ( in Infancy ) ) ) ) ) ) . )
(ROOT (NP (NP (VBG Concentrating)) (PP (IN on) (NP (DT the) (JJ first) (CD two) (NNS years))) (PP (IN of) (NP (NP (VBN combined) (NNS studies)) (PP (IN on) (NP (NP (NNP Sudden) (NNP Unexpected) (NNP Deaths)) (PP (IN in) (NP (NNP Infancy))))))) (. .)))
Concentrating on the first two years of combined studies on Sudden Unexpected Deaths in Infancy .
(ROOT (S (NP (NP (DT The) (JJ first) (NN year)) (PP (IN after) (NP (NN birth)))) (VP (VBZ is) (VP (VBN called) (NP (NN infancy)))) (. .)))