Complex sentence: According to Kiernan, Humfrey's furnace was far more efficient than the traditional bole, and its eventual widespread adoption enabled rapid expansion of the mining industry after 1570, and the export from England of large quantities of lead.
Split into simpler sentences: According to Kiernan, Humfrey's furnace was far more efficient than the traditional bole. Its adoption enabled rapid expansion of the mining industry after 1570, and the export from England of large quantities of lead.