Complex sentence: At nineteen, he entered the first class of cinema of La Cambre (ISAD, Institut Supérieur des Arts Décoratifs, an art school created by Henry Van de Velde) from which he holds an unforgettable memory (no budget, no equipment).
Split into simpler sentences: At nineteen, he entered the first class of cinema of La Cambre at Institut Supérieur des Arts Décoratifs (ISAD) an art school created by Henry Van de Velde. From that class, he holds an unforgettable memory (no budget, no equipment).