org-agenda-skip-additional-timestamps-same-entry

org-agenda-skip-additional-timestamps-same-entry is a variable defined in `org-agenda.el'.
Its value is

nil

Documentation:
When nil, multiple same-day timestamps in entry make multiple agenda lines.
When non-nil, after the search for timestamps has matched once in an
entry, the rest of the entry will not be searched.

You can customize this variable.