Complex sentence: The school's name was changed to Nafia Fen Mektebi/School of Public Works in 1922 and the duration of education was increased to 2.5 years in 1926 and 3 years in 1931.
Split into simpler sentences: The school's name was changed to Nafia Fen Mektebi (School of Public Works) in 1922. The duration of education was increased to two and a half years in 1926 and three years in 1931.