Complex sentence: Today, this basket is composed of Japanese Yen, US Dollars, British Pounds and Euros, and the proportion each of these four currencies contribute to the nominal value of a SDR is reevaluated every five years.
Split into simpler sentences: Today, this basket is composed of Japanese Yen, US Dollars, British Pounds and Euros. The proportion each of these four currencies contribute to the nominal value of a SDR is reevaluated every five years.