It is not correct English. "that when" is not necessarily incorrect in itself: the "when" clause can be interpreted as parenthetical (though commas around it would help, and the comma after "floor" messes up the flow). g.
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It is not correct English. "that when" is not necessarily incorrect in itself: the "when" clause can be interpreted as parenthetical (though commas around it would help, and the comma after "floor" messes up the flow). This in itself is allowable, e.g. "A bore is the kind of person who, when he is asked how he is, tells you", although it is easy to create awkward sentences in this way, However