Complex sentence: Basic power plants were Hercules, Buda and Herschell-Spillman gasoline, and Cummins diesels, all 6-cylinder engines with plans drawn up by Kenworth Engineer Murry Aitkin and the vertical exhaust ordered produced by Kenworth Chief Engineer John Holmstrom.
Split into simpler sentences: Basic power plants were Hercules, Buda and Herschell-Spillman gasoline, and Cummins diesels, all 6-cylinder engines. Plans were drawn up by Kenworth Engineer Murry Aitkin and the vertical exhaust ordered produced by Kenworth Chief Engineer John Holmstrom.