Why are the Traditional Chinese and Simplified Chinese study guides available in two books instead of one?

The Traditional Chinese and Simplified Chinese study guides require additional time to translate and process.  Therefore, these translations are available in two parts.   The first book contains Intro – Lesson 14 and is available for purchase when the current study year’s products launch.   The second book contains Lesson 15 – Lesson 29 and is currently available for sale on the store website..