Complex sentence: As of 2006, the United States was the largest supplier of chicken to Russia, with only 55% of purchased chicken being domestically raised, 35% imported from the US, 6% from Brazil and 4% from other countries, primarily in Europe.
Split into simpler sentences: As of 2006 the United States was the largest supplier of chicken to Russia. In 2006 only 55% of purchased chicken was grown in Russia, 35% were imported from the US, 6% from Brazil and 4% from other countries, primarily in Europe.