Complex sentence: WikiLeaks legal adviser Jennifer Robinson saw its premiere at the Sundance Film Festival and commented: Julian (Assange) was advised not to participate in Gibney's film and having now seen it-he was absolutely right not to.
Split into simpler sentences: WikiLeaks legal adviser Jennifer Robinson saw the premiere of Gibney's documentary at the Sundance Film Festival. Ms Robinson commented, Julian (Assange) was advised not to participate in Gibney's film and having now seen it-he was absolutely right not to.