Complex sentence: Prior to this study, "P. lutea" had been considered synonymous with "P. auricula"; other synonyms of "P. auricula" include "P. balbisii" and "P. ciliata".
Split into simpler sentences: Prior to this study, "P. lutea" had been considered synonymous with "P. auricula". Other synonyms of "P. auricula" include "P. balbisii" and "P. ciliata".