Complex sentence: The last opinion polls published before the first round predicted that Peterle would win 40% of the vote and go to the run-off against either Türk or Gaspari, both at 20-25%, with most polls predicting a substantially larger share for Türk.
Split into simpler sentences: The last opinion polls published before the first round predicted a run-off between Peterle, who would win 40%, and either Türk or Gaspari. The latter received each 20--25%, with most polls predicting a substantially larger share for Türk.