憲法の規定に従い衆院の議決が参院に優越する。

。

Per the constitution's provisions, a House of Representatives decision takes precedence over one from the House of Councillors.

Literal

Constitution [attributive-の] provisions [according-to-に従い], House-of-Representatives [attributive-の] decision [subject-が] House-of-Councillors [at-に] takes-precedence.

Constitutional law reference. ~に従い (ren'yōkei stem-linking form of 従う, 'to follow') means 'in accordance with, per.' 衆院 is the abbreviation of 衆議院 ('House of Representatives'); 参院 of 参議院 ('House of Councillors'). 議決 ('decision, resolution'). 優越する ('to take precedence, to be superior') is formal.