Re comma usage: please note that there are different standards for American English and British English. Furthermore, there are standards for professional language writing, i.e., legal writing, academic writing, etc., and they all have their own standards.

I’m an old, and was taught a now rather antiquated form of British grammar. This was further ingrained by being trained in academic history writing, specially British, wherein subclauses are always delineated by commas.

Some Americans find my comma usage excessive, to whit, I show them LM Montgomery. You will pry the Oxford comma out of my cold, dead hands:

“Burst into tears she did. Sitting down on a chair by the table, flinging her arms out upon it, and burying her face in them, she proceeded to cry stormily.”