Complex sentence: He has published over 90 papers and eight books and was the joint editor of the European Journal of Population from 1992 to 2000 and in 1997 was elected to the Council of the International Union for the Scientific Study of Population.
Split into simpler sentences: He has published over 90 papers and eight books and was the joint editor of the European Journal of Population from 1992 to 2000. In 1997 he was elected to the Council of the International Union for the Scientific Study of Population.