Complex sentence: Followig his PhD, he did research at the National Research Council of Canada (1982-1985) and worked at E-One Moli Energy (1985-1990) before taking up a faculty position in the Physics Department at Simon Fraser University in 1990.
Split into simpler sentences: Followig his PhD, Dahn did research at the National Research Council of Canada from 1982 until 1985, before working at E-One Moli Energy until 1990. At that time, he took up faculty position in the Physics Department at Simon Fraser University in 1990.