Complex sentence: By the time Brown's monograph appeared in print, Brown had exchanged the generic name "Josephia" for "Dryandra", giving the name "Dryandra floribunda" to Knight's "Josephia sessilis".
Split into simpler sentences: By the time Brown's monograph appeared in print, Brown had exchanged the generic name "Josephia" for "Dryandra". Brown gave the name "Dryandra floribunda" to Knight's "Josephia sessilis".