Complex sentence: Later, Ritva Koistinen became the first traditional playing lecturer in Finland at the Joensuu Music Institute, and in 1987, she founded the Sibelius Academy, a school for solo kantele players, in Helsinki.
Split into simpler sentences: Later, Ritva Koistinen became the first traditional playing lecturer in Finland at the Joensuu Music Institute. In 1987, she founded the Sibelius Academy, a school for solo kantele players, in Helsinki.