Complex sentence: It was formerly known as Omniture SiteCatalyst before Adobe Systems bought Omniture for of $1.8 billion on October 23,2009 together with other acquisitions like Day Software and Efficient Frontier, as the main components of Adobe's Digital Marketing Business Unit.
Split into simpler sentences: It was formerly known as Omniture SiteCatalyst before Adobe Systems bought Omniture for of $1.8 billion on October 23,2009. This acquisition took place together with others like Day Software and Efficient Frontier that became the basis of Adobe's Digital Marketing Business Unit.