Complex sentence: Such found examples are isotopically-distinct clusters of material found in the fine-grained matrix of primitive meteorites, such as chondrites, whose isotopic differences from the surrounding meteorite suggest that they predate the solar system.
Split into simpler sentences: Such found examples are isotopically-distinct clusters of material found in the fine-grained matrix of primitive meteorites, such as chondrites. Their isotopic differences from the surrounding meteorite suggest that those clusters predate the solar system.