unkompliziert
uncomplicated
Simple and not difficult to understand, handle, or carry out.
Die Montage des Regals war überraschend unkompliziert.
Assembling the shelf was surprisingly uncomplicated.

uncomplicated / easygoing
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uncomplicated
Simple and not difficult to understand, handle, or carry out.
Die Montage des Regals war überraschend unkompliziert.
Assembling the shelf was surprisingly uncomplicated.

The word is the opposite of 'kompliziert' (complicated). The prefix 'un-' is used very frequently in German adjectives to negate a meaning.
Die Anleitung war klar und unkompliziert.
The instructions were clear and uncomplicated.
'Unkompliziert' (uncomplicated) can also be used as an adverb to describe how an action is carried out. It then means 'in a simple way'.
Wir konnten das Problem ganz unkompliziert am Telefon lösen.
We were able to solve the problem very simply over the phone.
When talking about things or processes, 'unkompliziert' (uncomplicated) is often combined with words such as 'Lösung' (solution), 'Prozess' (process), 'Abwicklung' (handling/processing), or 'Hilfe' (help).
Vielen Dank für die schnelle und unkomplizierte Hilfe!
Thank you very much for the quick and uncomplicated help!
To describe a person, 'unkompliziert' (easygoing) is often connected with 'Mensch' (person), 'Typ' (guy/type), or 'Charakter' (character).
Mein neuer Kollege ist ein sehr unkomplizierter Typ.
My new colleague is a very easygoing guy.
simple / just
'einfach' and 'unkompliziert' can both mean that something is not difficult and can be done without major problems. 'einfach' is very general and works for tasks, explanations, questions, or routes. 'unkompliziert' emphasizes more strongly that something takes little effort and is easy to handle. When describing people, 'unkompliziert' also means that someone is pleasant and not difficult to deal with; 'einfach' is not used with that same meaning.

Die Anmeldung im Bürgerbüro war heute überraschend unkompliziert.
Registering at the citizens' office was surprisingly uncomplicated today.
Die Anleitung ist einfach, deshalb verstehe ich sie sofort.
The instructions are easy, so I understand them right away.