Complex sentence: Earlier versions of the website credit the TVNZ Archive as the provider of much of the TVNZ content, however in current versions of the NZ On Screen website the source of the titles are attributed to Ngā Taonga.
Split into simpler sentences: Earlier versions of the website credit the TVNZ Archive as the provider of much of the TVNZ content. However in current versions of the website the source for those titles is attributed to Ngā Taonga.