source: According to the World Bank, Russia has experienced a period of strong economic growth during the 2000s, however, by 2012, growth slowed down dramatically as reforms have come along at a slower pace.
target: According to the World Bank, Russia has experienced a period of strong economic growth during the 2000s.  However, by 2012, growth slowed down dramatically.  It was because reforms have come along at a slower pace.
references: According to the World Bank, Russia has experienced a period of strong economic growth during the 2000s.  However, by 2012, growth slowed down dramatically.  It was because reforms have come along at a slower pace.