Complex sentence: After the country was liberated, she resumed with her study: however, her professor Milojević died in 1946, therefore she graduated with Josip Slavenski, as the first female graduate in composition.
Split into simpler sentences: After the country was liberated, she resumed her study. However, her professor Milojević died in 1946, and therefore she graduated with Josip Slavenski as the first female graduate in composition.