Complex sentence: PNC operators undergo initial training to operate the system which usually consists of a five day course to view data and conduct simple queries, further courses are available to expand the users access level to update and conduct more in-depth queries.
Split into simpler sentences: PNC operators undergo initial training to operate the system which usually consists of a five day course to view data and conduct simple queries. Further courses are available to expand the user's access level to update and conduct more in-depth queries.