请教一下下面这两句英语怎么理解we had a pleasant luncheon in which little wa

请教一下下面这两句英语怎么理解
we had a pleasant luncheon in which little was said of the business which had brought us together.It was in the private sitting-room to which we afterwards repaired that Holmes asked Baskerville what were his intentions.这里面好多which 之类的引导的从句,弄混乱了.