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Before A widow in most societies is often abandoned and left with very little resources to care for herself and her children.   After A widow, in most societies, is often abandoned and left with very little resources to fend for herself and her children.  Notes: The expression "in most societies" is set off by commas since it is a non-restrictive clause or a non-essential clause. This means that even if it is removed from the sentence, the rest of the sentence will still make sense. That's a comma rule. Replaced 'care' with fend' since it is the right word choice.

Before In a changing environment where the new keywords are cloud, automation, data-led analytics, IoT, and mobility, the solutions expected from IT service providers as well as the nature of their delivery are undergoing a change.  After In a business scenario where the buzzwords are cloud, automation, data-led analytics, IoT, and mobility, the solutions expected from IT service providers, as well as the nature of their delivery, are undergoing a change. Notes:  Changed 'changing environment' to 'business scenario' since it gives context. Keywords are for blogs or SEO; buzzwords are " a word or phrase, often an item of jargon, that is fashionable at a particular time or in a particular context. " This was an issue of word choice.  'as well as the nature of their delivery' is a non- restrictive clause. This means that even if you take the clause out of the sentence, it will still make sense. The rule ...