Complex sentence: It underwent a name change in May 1920, becoming the rather unimaginatively named "Aktiengesellschaft fuer Automobilbau" ("AGA"), and was acquired in 1922 by the group of companies.
Split into simpler sentences: It underwent a name change in May 1920, becoming the rather unimaginatively named "Aktiengesellschaft für Automobilbau" (public company for car manufacturing) or "AGA". It was acquired in 1922 by the group of companies.