Complex sentence: This type of AU has appeared in mainstream publication as well, in "Star Trek" short stories from the early 1970s in which the actors from the Desilu set were swapped with the "real life" Starfleet officers via the transporter.
Split into simpler sentences: This type of AU has appeared in mainstream publication as well. In "Star Trek" short stories from the early 1970s in which the actors from the Desilu set were swapped with the "real life" Starfleet officers via the transporter.