Complex sentence: The sports complex has been the training centre of Paris Saint-Germain since the club's foundation in 1970, as well as playing host to the Paris Saint-Germain Youth Academy since its opening on 4 November 1975.
Split into simpler sentences: The sports complex has been the training centre of Paris Saint-Germain since the club's foundation in 1970. It also hosts the Paris Saint-Germain Youth Academy, which opened on 4 November 1975.