, the number of married women in employment having more than doubled in the last twenty-five years.
This sentence itself does not make sense gramatically, doesn't it ?(due to no main verb) but it perhaps becomes a complete sentence with additionals before comma.
but this practice has become so widespread that the working mother is now a not unusual factor in a child's home life, the number of married women in employment having more than doubled in the last twenty-five years.
Even though this is a full sentence, I don't understan how having ~ doubled can come. (It seems like participle phrase, but don't know how I can analyse in this sentence)
Top answer
I agree with you that the first one is not a sentence and that the second one is. We decided to leave the stadium, the game having concluded. This is a common construction.
— Avangi
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The working mother is not unusual, the number ... having more than doubled ... = The working mother is not unusual because the number ... has more than doubled ...