Complex sentence: Since 1993, he has been a professor at the faculty of Architecture, Urban and Landscape Planning at the University of Kassel, and since 2009 has lead the research project'Sintropher' in close collaboration with Sir Peter Hall (urbanist).
Split into simpler sentences: Since 1993, he has been a professor at the faculty of Architecture, Urban and Landscape Planning at the University of Kassel. Since 2009 he has led the research project'Sintropher' in close collaboration with Sir Peter Hall (urbanist).