Complex sentence: In 1971 he was appointed Professor of Practical Theology at the Kampen Theological University he was heavily engaged in church affairs and was regarded as a leader of the orthodox wing of the Reformed Church (Gereformeerde Kerken van Nederland).
Split into simpler sentences: In 1971 he was appointed Professor of Practical Theology at the Kampen Theological University. During his professorship he was heavily engaged in church affairs and was regarded as a leader of the orthodox wing of the Reformed Church (Gereformeerde Kerken van Nederland).