Complex sentence: Young liberals formed the Federation of Young Democrats (Fidesz); a core from the so-called Democratic Opposition formed the Association of Free Democrats (SZDSZ), and the national opposition established the Hungarian Democratic Forum (MDF).
Split into simpler sentences: Young liberals formed the Federation of Young Democrats (Fidesz). A core from the so-called Democratic Opposition formed the Association of Free Democrats (SZDSZ) and the national opposition established the Hungarian Democratic Forum (MDF).