“I am" is reportedly the shortest sentence in the English language. Could it be that "I do" is the longest sentence?”
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George Carlin 270
American stand-up comedian 1937–2008Related quotes

Interview, The Paris Review (Summer 1956)

Statement on I. Lewis "Scooter" Libby decision http://www.msnbc.msn.com/id/19570172/ (July 2, 2007)
2000s, 2007

“I am trying to say it all in one sentence, between one cap and one period.”

Source: Sex, Art and American Culture : New Essays (1992), Junk Bonds and Corporate Raiders : Academe in the Hour of the Wolf, p. 204, on John Winkler’s claim that “Sappho’s consciousness is a larger circle enclosing the smaller one of Homer,” in Winkler’s Constraints of Desire.

Variant: A linguistic variable is defined as a variable whose values are sentences in a natural or artificial language.
Source: 1970s, Outline of a new approach to the analysis of complex systems and decision processes (1973), p. 28