Complex sentence: Similarly, on December 9, Cartoon Network revealed that the miniseries would have a unique title sequence, although their announcement did not specifically explain what "Islands" was or when it would air.
Split into simpler sentences: Similarly, on December 9, Cartoon Network revealed that the miniseries would have a unique title sequence. The announcements concerning the intro sequence, however, did not specifically explain what "Islands" was or when it would air.