Complex sentence: It provides an overview of more than 1,400 years of Russian history beginning in the 6th to 9th centuries with the migration of Slavs from central Europe to the northeast and ends with the collapse of the Soviet Union in 1991.
Split into simpler sentences: It provides an overview of more than 1,400 years of Russian history beginning in the 6th to 9th centuries with the migration of Slavs from central Europe to the northeast. It ends with the collapse of the Soviet Union in 1991.