Complex sentence: The Action libérale nationale was a newly-formed party led by Paul Gouin, son of former Liberal premier Lomer Gouin, and contained former Liberals who had become dissatisfied with the party.
Split into simpler sentences: The Action libérale nationale (ALN) was a newly-formed party led by the son of former Liberal premier Lomer Gouin. It was established by former Liberals who had become dissatisfied with the party.