Complex sentence: Normally, participants must not be beginners in the field under discussion at US and Canadian universities, seminar classes are generally reserved for upper-class students, although at UK and Australian universities seminars are often used for all years.
Split into simpler sentences: Normally, participants must not be beginners in the field under discussion at US and Canadian universities. Seminar classes are generally reserved for upper-class students, although at UK and Australian universities seminars are often used for all years.