Complex sentence: Ukraine intended to import less gas in 2010 as a result of reduced industry needs because of its economic recession; however, Gazprom insisted that Ukraine fulfill its contractual obligations and purchase the previously agreed upon quantities of gas.
Split into simpler sentences: Ukraine intended to import less gas in 2010 as a result of its economic recession. Due to this fact industries require far less gas, however, Gazprom insisted that Ukraine fulfill its contractual obligations and purchase previously agreed upon quantities of gas.