Complex sentence: In 1964 Supek with several colleagues from the Zagreb Faculty of Philosophy founded the "Praxis" journal and was co-editor of the journal from 1967 to 1973.
Split into simpler sentences: In 1964 Supek and several colleagues from the Zagreb Faculty of Philosophy founded the "Praxis" journal. Supek was co-editor of the journal from 1967 to 1973.