Complex sentence: There are more than 100,000 surviving stone inscriptions in China, but only approximately 30,000 have been transcribed or had rubbings made, and fewer than those 30,000 have been formally studied.
Split into simpler sentences: There are more than 100,000 surviving stone inscriptions in China. However, only approximately 30,000 have been transcribed or had rubbings made, and fewer than those 30,000 have been formally studied.