  The state-of-the-art on basic, single-antecedent anaphora has greatly
improved in recent years. Researchers have therefore started to pay more
attention to more complex cases of anaphora such as split-antecedent anaphora,
as in Time-Warner is considering a legal challenge to Telecommunications Inc's
plan to buy half of Showtime Networks Inc-a move that could lead to all-out war
between the two powerful companies. Split-antecedent anaphora is rarer and more
complex to resolve than single-antecedent anaphora; as a result, it is not
annotated in many datasets designed to test coreference, and previous work on
resolving this type of anaphora was carried out in unrealistic conditions that
assume gold mentions and/or gold split-antecedent anaphors are available. These
systems also focus on split-antecedent anaphors only. In this work, we
introduce a system that resolves both single and split-antecedent anaphors, and
evaluate it in a more realistic setting that uses predicted mentions. We also
start addressing the question of how to evaluate single and split-antecedent
anaphors together using standard coreference evaluation metrics.
