Complex sentence: In 1965, Burkard established a BMW tuning business, following his success with investments in the stock market, he started the tuning business in an outbuilding of the original Alpina typewriter factory.
Split into simpler sentences: In 1965, Burkard established a BMW tuning business, following his success with investments in the stock market. He started the tuning business in an outbuilding of the original Alpina typewriter factory.