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Calibre Editor could have better UI for this instead of the "a the bottom of a locked filing cabinet in a disused men's lavatory with a sign on the door 'beware of the leopard'" type of UI that it uses, but it has the ability to split the xHTML file.
Simply use the "secret handshake" of right-clicking anywhere on the xHTML code and select the "Split at multiple locations..." option from the resulting context menu. There is no other menu entry or default toolbar icon to indicate that this function is present. You then enter a RegEx or use the Wizard to create one. The downside is that you can't manually split at a single spot in any simple way. There will be splits at each and every place that meets the RegEx's definition.
You may find it desirable to use Preferences > Toolbars to add a toolbar icon to one or more of the toolbars to make finding this function a bit easier.
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