Complex sentence: In addition to the American High School Diploma, ISB offers both the French Baccalaureate and International Baccalaureate (IB)--the equivalent of the American Advanced Placement (AP) program.
Split into simpler sentences: In addition to the American High School Diploma, ISB offers both the French Baccalaureate and International Baccalaureate (IB). The IB is the international equivalent of what is known in the US as the Advanced Placement (AP) program.