When training journalists, I joke that Americans use more commas than British journalists* because they are rich and can afford the extra ink.
* Or Irish, Australian, New Zealand.
You find long, comma-packed sentences in American newspapers. They don’t make for easy reading.
Use plenty of full stops instead — periods if you’re American — and spare the comma.
Keeping track of who does what to whom is hard in long, comma-laden sentences. Breaking sentences into smaller units of meaning makes writing easier to follow.
Only use commas where they aid understanding.
Writers often underrate the comma’s use as an aid to sense.
Some Americans put commas between all clauses and sub-clauses. Grammar checking software tells you to do the same. Ignore the nagging.
British-trained writers avoid them between short clauses at the start of sentences.
Americans also use commas before and at the end of a list of items. This is sometimes called the Oxford comma. That subject opens a fresh can of worms.
In Britain the last comma only gets used when one of the sequence items includes an and.
Some experts say Americans are moving towards British patterns and commas are now less common on both sides of the Atlantic. Let’s hope so.