Complex sentence: "The Story in Your Eyes" was the Moody Blues' final single to feature only the mellotron as it would be supplied by the chamberlin, a similar instrument in time for their next album, "Seventh Sojourn".
Split into simpler sentences: The Story in Your Eyes was the Moody Blues' final single to feature the mellotron. The mellotron would be replaced by the chamberlin, a similar instrument in time for their next album, "Seventh Sojourn".