Complex sentence: "Move" wasn't supposed to be the album's original promotional track instead the company had chosen the album's B-side "Love" however Taemin decided against the song, since he didn't think it would allow him to show his true identity.
Split into simpler sentences: Move was not supposed to be the album's original promotional track, as the company had chosen the album's B-side "Love" instead. However Taemin decided against the song, since he did not think it would allow him to show his true identity.