Complex sentence: Since its inception it has been the home of the Edinburgh International Film Festival and has since has been host to many film luminaries such as Martin Scorsese, Andrei Tarkovsky, Sean Connery and James Mason.
Split into simpler sentences: Since its inception it has been the home of the Edinburgh International Film Festival. It has since has been host to many film luminaries such as Martin Scorsese, Andrei Tarkovsky, Sean Connery and James Mason.