Two employees are discussing their boss, who couldn't focus on his business for some time because a big part of his focus was on his son't deteriorating health.
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Mr. TomDo I need a comma after the word boss?Yes. You have a non-defining relative clause there.
Mr. Tomsome time or sometime?Two in this durational sense.
Mr. TomThe large part of his concentration was on his son's deteriorating heath.A large part ... OR The larger part ...