Complex sentence: Contacts with other cultures through colonialism and soon the new discoveries of archaeology expanded the repertory of ornament available to revivalists, until its sheer variety became burdensome; after about 1880, photographic illustration made details of ornament even more widely available than prints had done.
Split into simpler sentences: Contacts with other cultures through colonialism and the new discoveries of archaeology expanded the repertory of ornament available to revivalists. After about 1880, photography made details of ornament even more widely available than prints had done.