Original sentence: A "hello world" program is typically one of the simpler programs possible in a computer language.Some are surprisingly complex, especially in some Graphical User Interface (GUI) contexts.Some others are surprisingly simple, especially those which heavily rely on a particular shell to perform the actual output
Edited sentence: A "hello world" program is typically one of the simpler programs possible in a computer language, but some are surprisingly complex, especially in some Graphical User Interface (GUI) contexts