You can usually find simplified chapter-wise books on Tattvartha Sutra at:

• Jain temples and upashray libraries
• Jain bookshops
• Publishers of Jain literature
• Online Jain पुस्तक stores
• Digital Jain libraries and study materials

If you want an easier start, look for books titled like:

• “Tattvartha Sutra Simplified”
• “Tattvartha Sutra with meaning”
• “Tattvartha Sutra by chapters”
• “Tattvartha Sutra guide for beginners”

For a simpler study method, choose books that include:

• Sutra
• word meaning
• simple explanation
• chapter-wise summary

If you want, I can also help you with a simple chapter-wise outline of Tattvartha Sutra in very easy language.