Complex sentence: While his fortune is in the realms of speculation, the Sunday Times Rich List 2007 placed him among the richest in both Britain and Ireland, estimating his financial worth at €1.2 billion (£850 million).
Split into simpler sentences: While his fortune is in the realms of speculation, the Sunday Times Rich List 2007 placed him among the richest in both Britain and Ireland. It is estimated that his financial worth is €1.2 billion (£850 million).