Simplify the following text for a Grade 12 native English-speaking person.
Original: A lingua franca ( originally Italian for â Frankish languageâ -- see etymology below ) is a language systematically used to make communication possible between people not sharing a mother tongue , in particular when it is a third language , distinct from both mother tongues .
Simplified: A lingua franca ( originally Italian for `` Frankish language '' - see etymology below ) is a language that is used between persons who have not the same mother tongue .