Complex sentence: In 1716 Juncker returned to Halle, brought back by Francke as medical supervisor of the school, orphanage and clinic that Francke had founded, collectively known as the Franckesche Stiftungen or Francke Foundations.
Split into simpler sentences: In 1716 Juncker returned to Halle at the request of Francke, to become medical supervisor of the school, orphanage and clinic that Francke had founded. The institutions were collectively known as the Franckesche Stiftungen or Francke Foundations.