Complex sentence: The pair founded Garmin in 1989 in Lenexa, Kansas as ProNav ProNav offered its first product for $2,500 USD and had the US Army as its first customer in 1991.
Split into simpler sentences: The pair founded Garmin in 1989 in Lenexa, Kansas as ProNav. Its first product for $2,500 USD and had the US Army as the first customer in 1991.