Complex sentence: Instant-runoff voting (IRV), alternative vote (AV), transferable voting, or preferential voting is an electoral system used to elect a single winner from a field of more than two candidates.
Split into simpler sentences: Instant-runoff voting (IRV) has several alternative names such as alternative vote (AV), transferable voting, or simply preferential voting. It is an electoral system used to elect a single winner from a field of more than two candidates.