Original sentence: The result, Silicon Valley Breakdown, was premiered at the Vennice Biennale in 1983 and has been performed in over twenty-five countries and regarded as a landmark work in the field
Edited sentence: The result, Silicon Valley Breakdown, was premiered at the Vennice Biennale in 1983 and has been performed in over twenty-five countries and regarded as a landmark work in the field [this is a sample of references]