Complex sentence: Everybody thought that Slade was dead and several angry townsfolk chased Beni out of Julesburg, but when they returned they found Slade struggling to his feet; somehow he miraculously recovered.
Split into simpler sentences: Everybody thought that Slade was dead and several angry townsfolk chased Beni out of Julesburg. When they returned, they found Slade struggling to his feet, having miraculously recovered.