With the default segmentation rules, CT will cut a sentence before the end if it's between brackets, like this:
（Some Japanese text。)
CT cuts after the period ("。"), leaving the closing bracket alone in the next segment.
Default and simple segmentation rules are preset. However, you can try out the much more advanced segmentation option by choosing Rules.srx in the Edit > Preferences > Segmentation box. After starting a new project, the bracket following the period should not be cut in the Japanese source.
When this advanced segmentation option is selected, CT also lets you edit the Rules.srx in its Segmentation editor which gets activated next to the Segmentation box. However, note the advanced and editable segmentation rules follow regular expression syntax and may require some basic knowledge of it.