Complex sentence: Part of the Fund's interest in British Energy was realised on 31 May 2007, when it converted approximately 30% of its entitlement to British Energy's free cashflow into 450m British Energy shares.
Split into simpler sentences: Part of the Fund's interest in British Energy was realised on 31 May 2007. On that date, the Fund converted approximately 30% of its entitlement to British Energy's free cashflow into 450m British Energy shares.