Complex sentence: Since the 2011--12 school year, chess lessons have been made part of the curriculum in every public school in Armenia by the Ministry of Education making it the first country in the world to make chess mandatory in schools.
Split into simpler sentences: Since the 2011--12 school year, chess lessons have been made part of the curriculum in every public school in Armenia by the Ministry of Education. Armenia's the first country in the world to make chess mandatory in schools.