Complex sentence: It unfolds them to Paris and lasts a year for the students coming from the common Competition and the admitted one on dismissed titles, that they chose the "Paris courses" or the "Sophia-antipolis courses".
Split into simpler sentences: It unfolds them to Paris and lasts a year for the students coming from the common Competition and those admitted on dismissed titles. It takes place in Paris whether they've chosen the "Paris courses" or the "Sophia-antipolis courses".