Complex sentence: In 2008, the largest maker of Oscilloscopes in the United States, Tektronix, of Beaverton, Oregon and SyntheSys Research signed an "OEM" agreement to sell the SyntheSys Research CR12500 clock-recovery instrument through Tektronix's sales channel.
Split into simpler sentences: In 2008, the largest makers of Oscilloscopes in the United States was Tektronix, of Beaverton, Oregon. At that time, SyntheSys Research and Tektronix agreed to an "OEM" agreement to sell the SyntheSys Research CR12500 clock-recovery instrument through Tektronix's sales channel.