Complex sentence: The International Mathematical Olympiad (IMO) is an annual six-problem, two-day, international high school mathematics competition focused primarily on pre-collegiate mathematics, and is the oldest of the International Science Olympiads.
Split into simpler sentences: The International Mathematical Olympiad (IMO) is an annual six-problem, two-day, international high school mathematics competition. It focuses primarily on pre-collegiate mathematics, and is the oldest of the International Science Olympiads.