Complex sentence: But by the end of the tour, relationships had soured again and plans for a US tour and "MTV Unplugged" album were scrapped and as a result, the European tour turned out to be the last for the Velvet Underground.
Split into simpler sentences: But by the end of the tour, relationships had soured again and plans for a US tour and "MTV Unplugged" album were scrapped. The European tour turned out to be the last for the Velvet Underground.