Complex sentence: Stefan Stenudd (1954 -) is a Swedish aikido teacher, writer, astrologist and freelance journalist who is one of the most prominent aikido teachers, and also holds positions in several aikido organisations both national and international.
Split into simpler sentences: Stefan Stenudd (born 1954) is one of the most prominent aikido teachers in Sweden, and also active as writer, astrologist and freelance journalist. Stenudd holds positions in several aikido organisations, both national and international.