Complex sentence: On 13 January 2006, Volkswagen Group finally announced that negotiations about the partnership had failed because its desires clashed with the terms and conditions offered by Proton; their interest was more in eventually controlling Proton Holdings, rather than just being a strategic partner.
Split into simpler sentences: On 13 January 2006, Volkswagen Group finally announced that negotiations about the partnership had failed because VWAG's desires clashed with the terms and conditions offered by Proton. VWAG were more interested in eventually controlling Proton Holdings, rather than just being a strategic partner.