Complex sentence: Cultivated for centuries in parts of Japan, and perhaps nearly as well known as another sour citrus, the yuzu in that country, it has been considered an "indispensable companion" to eating matsutake mushroom.
Split into simpler sentences: Cultivated for centuries in parts of Japan, and perhaps nearly as well known as another sour citrus, the yuzu in that country. It has been considered an "indispensable companion" to eating matsutake mushroom.