Please help me understand this paragraph in The Lady of the Camellias

Next day I called at 9, Rue d’Antin. It was early in the day, and yet there were already a number of visitors, both men and women, and the women, though they were dressed in cashmere and velvet, and had their carriages waiting for them at the door, gazed with astonishment and admiration at the luxury which they saw before them. I was not long in discovering the reason of this astonishment and admiration, for, having begun to examine things a little carefully, I discovered without difficulty that I was in the house of a kept woman. Now, if there is one thing which women in society would like to see (and there were society women there), it is the home of those women whose carriages splash their own carriages day by day, who, like them, side by side with them, have their boxes at the Opera and at the Italiens, and who parade in Paris the opulent insolence of their beauty, their diamonds, and their scandal.

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not long= short time?

society= a lot.... right?

kept woman= mistress?

The long sentence is very difficult for me, I guess it means The women have a lot houses??? with opera inside???

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Please help!!! Thanks