Complex sentence: Entity Framework (EF) is an open source object-relational mapping (ORM) framework for ADO.NET, was a part of.NET Framework, but from Entity framework version 6 it is separated from.NET framework.
Split into simpler sentences: Entity Framework (EF) is an open source object-relational mapping (ORM) framework for ADO.NET. It was a part of.NET Framework, but since Entity framework version 6 it is separated from.NET framework.