Complex sentence: In 2012, the American Jewish population was estimated at between 5.5 and 8 million, depending on the definition of the term, which constitutes between 1.7% and 2.6% of the total U.S. population.
Split into simpler sentences: In 2012, the American Jewish population was estimated at between 5.5 and 8 million, depending on the definition of the term. This constitutes between 1.7% and 2.6% of the total U.S. population.