Complex sentence: The preferred candidate of sporting director Ralf Ragnick as new head coach from the summer was former Mainz 05 coach Thomas Tuchel, but the negotiations with Thomas Tuchel failed.
Split into simpler sentences: The preferred candidate of sporting director Ralf Ragnick as new head coach from the summer was former 1. FSV Mainz 05 coach Thomas Tuchel, but the negotiations with Thomas Tuchel failed.