( ( They ( added ( ( a gene ) ( that ( ( would slowly ) ( ( ( ( add mass ) ( ( ( ( to ( their ( skeletal structure ) ) ) , ) especially ) ( around ( the cranium ) ) ) ) and ) ( slowly ( ( crush out ) ( ( the ( cognitive aspect ) ) ( of ( their brain ) ) ) ) ) ) ) ) ) ) ) ( This ( ( was ( ( their attempt ) ( at geonocide ) ) ) . ) ) )
(ROOT (S (S (NP (PRP They)) (VP (VBD added) (NP (NP (DT a) (NN gene)) (SBAR (WHNP (WDT that)) (S (VP (MD would) (ADVP (RB slowly)) (VP (VP (VB add) (NP (NN mass)) (PP (PP (TO to) (NP (PRP$ their) (JJ skeletal) (NN structure))) (, ,) (RB especially) (PP (IN around) (NP (DT the) (NN cranium))))) (CC and) (VP (ADVP (RB slowly)) (VB crush) (PRT (RP out)) (NP (NP (DT the) (JJ cognitive) (NN aspect)) (PP (IN of) (NP (PRP$ their) (NN brain)))))))))))) (NP (DT This)) (VP (VBD was) (NP (NP (PRP$ their) (NN attempt)) (PP (IN at) (NP (NN geonocide))))) (. .)))
They added a gene that would slowly add mass to their skeletal structure, especially around the cranium and slowly crush out the cognitive aspect of their brain This was their attempt at geonocide.
(ROOT (S (NP (NP (NNP Cranium)) (PRN (-LRB- -LRB-) (NP (NN skull)) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT the) (JJ skeletal) (NN structure)) (PP (IN of) (NP (NP (DT the) (NN head)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBZ supports) (NP (DT the) (NN face))) (CC and) (VP (VBZ protects) (NP (DT the) (NN brain)))))))))))) (. .)))