Complex sentence: Emacs has over 2,000 built-in commands and allows the user to combine these commands into macros to automate work, in particular with the use of Emacs Lisp, a variant of Lisp, providing a deep extension capability.
Split into simpler sentences: Emacs has over 2,000 built-in commands and allows the user to combine these commands into macros to automate work. The use of Emacs Lisp, a variant of the Lisp programming language, provides a deep extension capability.