Xerox Corp. shareholder Darwin Deason sued to block a reorganization that would effectively reverse its $6.2 billion takeover of the company he founded, Affiliated Computer Services Inc. Deason, 76, argues that the split, planned for completion by the end of the year, would leave him with an investment in an "unattractive, low-growth" document technology business, according to a complaint filed Wednesday in federal court in Dallas. As part of the takeover, Deason negotiated for preferred shares in Xerox that were specifically designed to compensate for his controlling stake in ACS and to "guarantee his continued investment in the combine investment-grade business of the company," according to the suit. ACS became the heart of Xerox's business process outsourcing operation, Deason said in the filing. He owns about 6 percent of Xerox shares. "Mr. Deason's lawsuit is meritless and we intend to seek its dismissal," Xerox spokesman Carl Langsenkamp said in an e-mail.