It is one word in German. It has one article, Germans talk about it as about a single word and treat it as a single word for grammar purposes. You can use it as a single noun in any sentence.

But it also odd example for this, because it is long as hell anyway already and additional spacing that English equivalent would require is just opportunity to wrap. It is just harder to read, but English equivalent would be easier to layout.

It really is one "new" word consisting of a bunch of words spelled without spaces. It is a compound, where every word adds additinal information to the last component. An easier example is sth like "Altbauwohnung" which would be an apartment (Wohnung) in an old (alt) building (Bau) where "Altbau" is also a compound. This way of compunding enables you to build new words everyone can understand the first time they encounter them, but also to build those stupidly long words.

It’s one word, like watchmaker or bookkeeper are in English.