Complex sentence: He did his secondary education at the Lycée Esteqlal there, graduating in 1985 and then going on to Kabul Polytechnic Institute, where he received an M.S. in engineering in 1991.
Split into simpler sentences: He did his secondary education at the Lycée Esteqlal there, graduating in 1985. He went on to the Polytechnical University of Kabul, where he received an M.S. in engineering in 1991.