第一句看上去还是不对，应该把中间的逗号去掉：

The outcomes of clinical trials outside China were not “promising” as claimed by Beaumont Hospitals.

或者更直接一点（离中文远一点）：

The outcomes of clinical trials outside China were claimed to be “promising” by Beaumont Hospitals. However, this is far from the truth.

最后面两个有点乱，我的意思是：

Dr. Xiao has reported 时态不对，应为 Dr. Xiao had reported

6 cases of SCI in Germany all failed 这里all的用法比较奇怪，时态也不对。可改为 all of the 6 SCI cases in Germany had failed