Complex sentence: The O level examinees have scored "Highest in The World" under CIE in different subjects consecutively for five years (2005,2006,2007,2008,2009), while students have continuously been scoring "Highest in Bangladesh" under CIE in O Levels.
Split into simpler sentences: The O level examinees haved scored "Highest in The World" under CIE in different subjects consecutively for five years (2005,2006,2007,2008,2009). While students have continuously been scoring "Highest in Bangladesh" under CIE in O Levels.