Complex sentence: Litvinenko died later in November from radiation poisoning caused by polonium-210, and on 22 May 2007 british officials charged Lugovoi with Litvinenko's murder, announcing they would seek his extradition from Russia.
Split into simpler sentences: Litvinenko died later in November from radiation poisoning caused by polonium-210, and on 22 May 2007. British officials charged Lugovoi with Litvinenko's murder, announcing they would seek his extradition from Russia.