Complex sentence: The move to open source created a second incarnation of PowerShell called "PowerShell Core" running on.NET Core, which is distinct from "Windows PowerShell" that runs on the full.NET Framework.
Split into simpler sentences: The move to open source created a second incarnation of PowerShell called "PowerShell Core", which runs on.NET Core. It is distinct from "Windows PowerShell", whichs runs on the full.NET Framework.