Complex sentence: In 1977 he negotiated the formation of the Cabinet van Agt I, in this cabinet he became Minister of the Interior and Deputy Prime Minister, Wiegel prepared the constitutional revision of 1983.
Split into simpler sentences: In 1977 he negotiated the formation of the first Van Agt cabinet, in this cabinet he became Minister of the Interior and deputy Prime Minister. During his period as Minister of the Interior, Wiegel prepared the constitutional revision of 1983.