Complex sentence: The period from 1520 to around 1560, encompassing Garamond's career as an artisan, was an extremely busy period for typeface creation, with a wide range of fonts created, some apparently for exclusive use by a specific printer, others sold or traded between them.
Split into simpler sentences: The period from 1520 to around 1560, encompassing Garamond's career, was an extremely busy period for typeface creation. Many fonts were created, some apparently for exclusive use by a specific printer, others sold or traded between them.