We don't have synonyms for sequelae yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are sequel, sequence and sequela.
(n) :
a narrative that is written after another narrative set in the same universe, especially a narrative that is chronologically set after its predecessors, or (perhaps improper usage) any narrative that has a preceding narrative of its own
(n) :
a narrative that is written after another narrative set in the same universe, especially a narrative that is chronologically set after its predecessors, or (perhaps improper usage) any narrative that has a preceding narrative of its own