Complex sentence: The Norwegian Non-fiction Writers Association was founded in 1978, and merged with The Norwegian Non-fiction Translators Association in 1990 to form The Norwegian Non-fiction Writers And Translators Association (NFF).
Split into simpler sentences: The Norwegian Non-fiction Writers Association was founded in 1978. In 1990, it merged with The Norwegian Non-fiction Translators Association to form The Norwegian Non-fiction Writers And Translators Association (NFF).