Complex sentence: Lister and Cat went to the hologram simulation suite-where Rimmer's hologram is generated-and Lister uploaded his own memory of the eight months he was going out with Lise Yates into Rimmer's memory.
Split into simpler sentences: Lister and Cat go to the hologram simulation suite where Rimmer's hologram is generated. Lister uploads 8 months of his memory when he was going out with Lise Yates into Rimmer's memory.