Textual: There is no chapter break here, but Mormon does signal a shift in topic. That shift is signaled by two markers in the text.
First, he uses the word “now” which word Mormon uses to initiate new thoughts.
Secondly, Mormon “marks time.” He indicates the timing of these actions as the second year of the reign of Alma. In the next set of verses Mormon gives a picture of the nature of the church at this particular point in time.
Historical: The second year of the reign of the judges would correlate to approximately 90 BC in the correlation used in this commentary.