不仅如此 can be translated as "not only that" in English. It is used to add emphasis to a statement or idea, and often indicates that there are additional reasons or supporting evidence for something.

Here are some examples of how 不仅如此 can be used in a sentence:

不仅如此，他还很聪明。 (Not only that, he is also very smart.)

我们不仅如死，还会提供更多的帮助。 (Not only that, we will also provide more help.)

这件事情不仅如此简单，还有许多其他因素需要考虑。 (Not only is this matter simple, there are many other factors to consider.)

In English, we often use similar phrases to express the same idea, such as "not only... but also," "not to mention," or "besides." For example:

Not only is he smart, but he is also very kind.

Not to mention, we will also provide more help.

Besides, there are many other factors to consider.