Complex sentence: In 1995, Rissasen became a key figure in running the English linguistics research unit Varieng at the University of Helsinki, and in 1998 was president of the Societas Linguistica Europaea.
Split into simpler sentences: In 1995, Rissasen became a key figure in running the English linguistics research unit Varieng at the University of Helsinki. In 1998, Rissanen was president of the Societas Linguistica Europaea.