Complex sentence: After 4 to 12 months, the conscript is promoted to "Rav Turai", after 18 to 24 months, promoted to "Samal", and after 24 to 32 months, promoted to "Samal Rishon".
Split into simpler sentences: After 4 to 12 months, the conscript is promoted to "Rav Turai". After 24 to 32 months, the conscript is promoted to "Samal Rishon".