Question: when did the eastern and western churches split
[{'answer': '1054', 'provenance': [{'wikipedia_id': '543935', 'title': 'East–West Schism', 'start_paragraph_id': 1, 'start_character': 69, 'end_paragraph_id': 1, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]