Original: While the two were discussing the 2006 remix of that album at a dinner party, Eno suggested adding lyrics and vocals to some songs that he had written and intended to finish, some of which were eight years old.
Simplified: While discussing the 2006 remix of that album at a dinner party, Eno suggested finishing some songs that he had written and intended to finish but that did not have lyrics, some of which were eight years old.