– The year of release. A Simple Murder originally released in 2020.
– Most likely a misspelling or concatenation of “A Simple Murders” or “A Simple Murder.” In fact, there is an Indian crime comedy web series called A Simple Murder (2020) that aired on SonyLIV. asimplemurders01ep052020720psonylivweb work
Why no dots or spaces? To avoid filesystem issues and make parsing easier for automation tools (Radarr, Sonarr, Plex, etc.). The at the end suggests it might be a WEB-DL (Direct Download from web) or WEBRip (recorded from web stream). – The year of release