Complex sentence: Two leaders of the white group forced entry and were shot to death by Sylvester Carrier, whereupon the remaining whites, at least two wounded, fled the scene, leaving a more serious wounded cmreade, Mannie Hudson, for dead on the Carrier porch.
Split into simpler sentences: Two leaders of the white group then forced entry and were shot to death by Sylvester Carrier. The remaining whites, at least two of them wounded, fled the scene, leaving a more seriously wounded cmreade, Mannie Hudson, for dead on the Carrier porch.