Complex sentence: Jakobson's Jewish background played big role in this event.Second big thing happened in Jabobsons career in 1973, when Organization for Security and Co-operation in Europe conference was held in Helsinki.
Split into simpler sentences: Jakobson's Jewish background played big role in this event. The second big thing happened in Jakobson's career in 1973 when the Organization for Security and Co-operation in Europe conference was held in Helsinki.