Complex sentence: Only four renditions at three concerts are known to have been played-however, it must be emphasised that "Another Day" dates from before the release of the "Boy" album and the majority of setlists from that era are unknown.
Split into simpler sentences: Only four renditions at three concerts are known to have been played. However, it must be emphasised that "Another Day" dates from before the release of "Boy" and the majority of setlists from that era are unknown.