Complex sentence: Illyrian movement (Croatian: "Ilirski pokret") was an organization of Croatian intellectuals from the first half of 19th century, which aimed for Croatian national establishment under Austro-Hungarian rule and sought for linguistic and ethnic unity among South Slavs.
Split into simpler sentences: Illyrian movement (Croatian: "Ilirski pokret") was a campaign initiated by a group of Croatian intellectuals during the first half of 19th century. This movement aimed to create a Croatian national establishment under Austro-Hungarian rule through linguistic and ethnic unity among South Slavs.