Original sentence: As a package is typically thought of as a directory, package diagrams provide a logical hierarchical decomposition of a system.In the Unified Modeling Language, a package diagram depicts how a system is split up into logical groupings by showing the dependencies among these groupings
Edited sentence: A Package Diagram is a type of diagram in the Unified Modeling Language that depicts how a system is split up into logical groupings and shows the dependencies among these groupings.As a package is typically thought of as a directory they make for a good logical hierarchical decomposition of the system