Even when the overall structure of an informational text is not sequential, certain events may be shown in time order. The reader may rely on dates or transition words to reassemble those events and determine how they interrelate.
So the completed sentence would read:
"Even when the overall structure of an informational text is not sequential, certain events may be shown in time order. The reader may rely on dates or transition words to reassemble those events and determine how they interrelate."