Complex sentence: It is known Holliday carried a coach gun from the local stage office into the fight; he was given the weapon just before the fight by Virgil Earp, as Holliday was wearing a long coat which could conceal it.
Split into simpler sentences: It is known Holliday carried a coach gun from the local stage office into the fight. He was given the weapon just before the fight by Virgil Earp, as Holliday was wearing a long coat which could conceal it.