The phrase "in that" is a common transitional phrase used to connect ideas and sentences. However, there are several synonyms that can be used in place of this phrase to add variety and depth to writing. One alternative is "because," which highlights the cause-and-effect relationship of the ideas. "Considering" is another option that emphasizes the fact that you are taking multiple perspectives or factors into account. "Given that" and "due to the fact that" are also useful phrases that can be swapped in for "in that" to convey a similar meaning. Ultimately, using a variety of transition words and phrases can add precision and clarity to your writing.