Grouped or linked activities will still appear chronologically in Timeline. Whether you're drafting a narrative to address the entire group or simply wanting to view the group in its entirety, you can use the "Show entire group" feature in Timeline.
After selecting the group, the Assign Modal appears on the right:
Select the "Edit Details" button to expand the modal:
Select "Show entire group in Timeline" to isolate the group and view all of its activities at once: