Complex sentence: An aluminium smelter consists of a large number of pots, steel containers lined with carbon, in which the electrolysis takes place; smelting is run as a batch process, with the aluminium metal deposited at the bottom of the pots and periodically siphoned off.
Split into simpler sentences: An aluminium smelter consists of a large number of cell (pots) in which the electrolysis takes place. Smelting is run as a batch process, with the aluminium metal deposited at the bottom of the pots and periodically siphoned off.