Complex sentence: In accordance with the ideas developed by Max Friz, Martin Stolle developed a 500 cc side-valve flat twin, referred to internally as the Type M2B15 and offered for sale officially as the "Bayernmotor".
Split into simpler sentences: In accordance with the ideas developed by Max Friz, Martin Stolle developed a 500 cc side-valve flat twin. This was referred to internally as the Type M2B15 and offered for sale officially as the "Bayernmotor".