Complex sentence: The dead are regarded as martyrs by both Sunni and Shia Muslims, and the battle has a central place in Shia history and tradition, and has frequently been recounted in Shia Islamic literature.
Split into simpler sentences: The dead are regarded as martyrs by both Sunni and Shia Muslims. The battle has a central place in Shia history and tradition, and has frequently been recounted in Shia Islamic literature.