Complex sentence: Unlike other towns in the neighbourhood, Imotski had educational system consisted od primary and secondary school as early as from the beginning of the 20th century, exactly, the secondary school was founded in 1912 during the Austro-Hungarian empire.
Split into simpler sentences: Unlike other towns in the area, Imotski had an educational system that consisted of primary and secondary schools as early as the beginning of the 20th century. The secondary school was founded in 1912 when Imotski was part of the Austro-Hungarian empire.