dhāraṇāsu = (loc. pl. f.) for dharana; concentration; harmony with thoughts; harmony in the mental body; the sixth of the eight steps. 
ca = (conj.) and
yogyatāḥ = (acc. pl. f./nom. pl.) fitness; preparedness; qualification; capability
manasaḥ = (g. sg. n./abl. sg. n./acc. pl. m./nom. pl. m./g. sg. m./abl. sg. m. from manas) mind