Complex sentence: In 1917, he become the member of the Armenian National Council, then the Parliament of Democratic Republic of Armenia, he organized the activities led to national freedom, effectively assisted by Assistant to Mouchegh Avedissian.
Split into simpler sentences: In 1917, he become a member of the Armenian National Council and the Parliament of the Democratic Republic of Armenia. As a member, he organized activities that led to national freedom, effectively assisted by Mouchegh Avedissian.