Complex sentence: Profile Scripting Language (PSL) is a language that implements OO concepts such as classes, methods, encapsulation and inheritance (and strong data typing) as extensions to the MUMPS language.
Split into simpler sentences: Profile Scripting Language (PSL) is a superset of the MUMPS programming language that adds object-oriented language features. PSL is a language that implements object orientated concepts such as classes, methods, encapsulation, inheritance, and strong data typing as extensions to the MUMPS language.