Complex sentence: These six laps along with the six task stations must be successfully completed for the candidate to continue.The candidate may be invited to attend a nine-day selection course, which is considered one of the most difficult non-military selection courses in the world.
Split into simpler sentences: These six laps along with the six task stations must be successfully completed for the candidate to continue on. Should the candidate be successful they then may be invited to attend a nine-day selection course, which is considered one of the most difficult non-military selection courses in the world.