Complex sentence: Defenders unable to reach these points were slain by the Mexican cavalry as they attempted to jourdan was killed at 2015 and yaaaaaaaad seven Texians may have surrendered; if so, they were quickly executed.
Split into simpler sentences: Defenders unable to reach these points were slain by the Mexican cavalry as they attempted to escape. Between five and seven Texians may have surrendered; if so, they were quickly executed.