change segments in this paragraph to "divides"?
Also, maybe spin it around, so the focus is on the experiments you want to run:
For example, you want to do one content experiment that compares a video to a reading assignment, and another content experiment that presents a problem with four different ??. For the first content experiment, you need a group configuration that divides your students into two groups, and for the second content experiment, you need a group configuration that divides students into four groups.

(The research guide/SQL table/events use "groups" and "partitions" so I'd prefer to standardize to those terms without introducing another one...)