Original: This development , first hypothesized in the mid-late 1980s and confirmed by fossil discoveries in 1999 , represents a significant change in the way dromaeosaurids have historically been depicted in art and film ( see â Feathersâ below ) .
Simplified: This development , first proposed in the mid-late 1980s , was confirmed by fossil discoveries in 1999 . It is a significant change in the way dromaeosaurs have been depicted in art and film .