Complex sentence: It is important to note that the quality of contemporary zhuni is not as high of that of earlier examples, and some aficionados of yixing stonware will suggest that "true" zhuni has been extinct since the 1970's.
Split into simpler sentences: It is important to note that the quality of contemporary zhuni is not as high of that of earlier examples. In fact, some aficionados of yixing stoneware will suggest that "true" zhuni has been extinct since the 1970's.