This pattern is used to say that something is true in addition to something else. It's a bit formal and common in written Japanese, such as news articles, essays, or formal speeches, but it can also be used in polite conversation. It emphasizes that the second item is added to the first, and the sentence often goes on to describe the combined effect or situation.

When you use it with a verb or adjective, you need to make it a noun phrase by adding こと (for verbs) or の (for adjectives) before に加えて. For example, 日本語を勉強することに加えて、文化も学びたい. However, the most common use is simply with nouns, as in the examples below.

The particle も or が often follows in the main clause, but it's not mandatory.