Complex sentence: The Petrarchan sonnet (also Petrarchanism or Petrarchian) refers to a of unattainable love, and was first developed by the Italian humanist and writer, Francesco Petrarca.
Split into simpler sentences: The Petrarchan sonnet (also Petrarchanism or Petrarchian) is a verse form that typically refers to a concept of unattainable love. It was first developed by the Italian humanist and writer, Francesco Petrarca.