Complex sentence: With heavy liquids, the sieved samples are placed in bromoform (density of 2.9 kg/l) and the heaviest minerals, such as zircon, rutile, and ilmenite sink to the bottom, where they are collected.
Split into simpler sentences: With heavy liquids, the sieved samples are placed in a high-density liquid, such as bromoform (density of 2.9 kg/l). The heaviest minerals, such as zircon, rutile, and ilmenite sink to the bottom, where they are collected.