Complex sentence: The Koan generative music engine was very deep; this is partially because of the long history of the product; development of the Koan engine started in 1990, when SSEYO was founded.
Split into simpler sentences: The Koan generative music engine was very deep; this is partially because of the long history of the product. Development of the Koan engine started in 1990, when SSEYO was founded.