verfassen
to compose
To formulate and develop a text in writing, especially a formal, literary, or official one.
Der Anwalt hat ein langes Schreiben an das Gericht verfasst.
The lawyer composed a long letter to the court.

to compose / write
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to compose
To formulate and develop a text in writing, especially a formal, literary, or official one.
Der Anwalt hat ein langes Schreiben an das Gericht verfasst.
The lawyer composed a long letter to the court.

'Verfassen' is an inseparable verb. The prefix 'ver-' remains firmly attached to the verb stem 'fassen' in all tenses and sentence constructions.
Er hat den ganzen Tag an dem Roman verfasst.
He spent the whole day composing the novel.
The verb 'verfassen' is mainly used in formal, official, or literary contexts. It sounds more elevated and deliberate than the everyday word 'schreiben' (to write).
Die Kommission muss einen offiziellen Bericht verfassen.
The commission has to compose an official report.
One typically 'verfasst' (composes) demanding or formal texts. Common combinations are: 'einen Brief verfassen' (to compose a letter), 'einen Artikel verfassen' (to compose an article), 'ein Testament verfassen' (to draw up a will), or 'eine Rede verfassen' (to compose a speech).
Der Politiker ließ seine Rede von einem Experten verfassen.
The politician had his speech composed by an expert.
to write
'schreiben' and 'verfassen' can both mean that you create a text. 'schreiben' is neutral and very general. You can write a message, a letter, an essay, or a book. 'verfassen' sounds more formal and is especially suitable when a text is planned, well phrased, or official, for example a report, a speech, or an application. In everyday life, people usually say 'schreiben'. 'verfassen' is used more when the text feels serious, professional, or literary.

Für die Sitzung hat Frau Becker einen kurzen Bericht verfasst.
Ms. Becker composed a short report for the meeting.
Du schreibst deiner Freundin noch eine Nachricht vor dem Einkauf.
You write your friend another message before going shopping.