Complex sentence: He worked for the cause of peace between the United Provinces and Spain, and was instrumental in the preliminary negotiations which set in motion the peace conference of Münster, where he served as Philip IV's trusted minister until his recall in 1647.
Split into simpler sentences: He worked for the cause of peace between the United Provinces and Spain, and was instrumental in the preliminary negotiations which set in motion the peace conference of Münster. He served as Philip IV's trusted minister until his recall in 1647.