Complex sentence: He has won more than a dozen major international awards including first prizes at the Oberhausen and Locarno film festivals, and in 1999 was invited to present a video retrospective of his work at the Tate Gallery, London.
Split into simpler sentences: He has won more than a dozen major international awards including first prizes at the Oberhausen and Locarno film festivals. In 1999 he was invited to present a video retrospective of his work at the Tate Gallery, London.