Complex sentence: Firstly if the endothelial cells are disrupted this will cause a lysis effect and internal bleeding, then as these hemorrhages increase the natural thrombin response is hindered by the effect of crotalin increasing the toxic effect.
Split into simpler sentences: Firstly if the endothelial cells are disrupted this will cause a lysis effect and internal bleeding. Then as these hemorrhages increase, the natural thrombin response is hindered by the effect of crotalin increasing the toxic effect.