Original sentence: Marriage (or Holy Matrimony) joins a man and a woman for mutual help and love (the unitive purpose), consecrating them for their particular mission of building up the Church and the world, and providing grace for accomplishing that mission
Edited sentence: Marriage (or Holy Matrimony) joins two people in love for mutual help and love (the unitive purpose), consecrating them for their particular mission of building up the Church and the world, and providing grace for accomplishing that mission