Complex sentence: In 2010, however, reports of Oman's preference for the Eurofighter emerged; this would be confirmed in December 2012, when Oman placed an order for 12 Eurofighters.
Split into simpler sentences: In 2010, however, reports of Oman's preference for the Eurofighter emerged. In December 2012, Oman placed an order for 12 Eurofighters.