Complex sentence: This however does not apply to all priests of the SSPX, as a minority of them-ordained before 1976 by archbishop Marcel Lefebvre for the SSPX-were and remained until now incardinated in several European dioceses.
Split into simpler sentences: This however does not apply to all priests of the SSPX. A minority of them-ordained before 1976 by archbishop Marcel Lefebvre for the SSPX-were and remained until now incardinated in several European dioceses.