Complex sentence: The next year, McLouth ordered 21 heaters (three spares) as part of a $105 million program which expanded the hot metal facilities to include a four strand caster and induction heaters.
Split into simpler sentences: The next year, McLouth ordered 21 heaters (including three spares) as part of a $105 million program. The program expanded the hot metal facilities with a four strand caster and the new induction heaters.