Complex sentence: The California Open Source Textbook Project (COSTP) is a collaborative, public/private undertaking created to address the high cost, content range, and consistent shortages of K-12 textbooks in California.
Split into simpler sentences: The California Open Source Textbook Project (COSTP) is a collaborative, public/private undertaking. It has been created to address the high cost, content range, and consistent shortages of K-12 textbooks in California.