vereinfacht
simplified
Presented in a simpler, less complex, or more easily understandable form.
Das ist eine sehr vereinfachte Darstellung eines komplizierten Problems.
That is a very simplified presentation of a complicated problem.

simplified
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simplified
Presented in a simpler, less complex, or more easily understandable form.
Das ist eine sehr vereinfachte Darstellung eines komplizierten Problems.
That is a very simplified presentation of a complicated problem.

'Vereinfacht' (simplified) is the past participle of the verb 'vereinfachen' (to simplify). This verb is made up of the prefix 'ver-' and 'einfach' (simple) and means 'to make something simple'. So 'vereinfacht' means 'made simple'.
Der Lehrer hat die komplizierte Regel für uns vereinfacht.
The teacher simplified the complicated rule for us.
This adjective often describes abstract concepts. Common combinations are 'eine vereinfachte Darstellung' (a simplified presentation), 'ein vereinfachtes Modell' (a simplified model), 'eine vereinfachte Erklärung' (a simplified explanation), or 'ein vereinfachter Prozess' (a simplified process).
Für die Präsentation habe ich ein stark vereinfachtes Schaubild erstellt.
For the presentation, I created a greatly simplified diagram.
The fixed expression 'vereinfacht gesagt' (put simply) usually stands at the beginning of a sentence in position 1. The conjugated verb then follows directly in position 2.
Vereinfacht gesagt, ist das Internet ein riesiges Netzwerk von Computern.
Put simply, the internet is a huge network of computers.
The word 'vereinfacht' (simplified) can also have a critical meaning and mean 'too simple' or 'superficial'. This is often the case when adverbs like 'stark' (greatly/heavily) or 'zu' (too) appear with it.
Seine Analyse ist eine zu vereinfachte Sicht auf die wirtschaftlichen Zusammenhänge.
His analysis is an overly simplified view of the economic relationships.
simple / just
'einfach' and 'vereinfacht' both have to do with being easy to understand. 'einfach' directly describes something as not complicated. 'vereinfacht' means that something has been made simpler or presented more simply than the full reality. Learners can confuse the words because both often occur with explanations. The difference is: a task can be simple from the beginning. An explanation is 'vereinfacht' if details are left out so that it is easier to understand. In the phrase 'vereinfacht gesagt' (put simply), you introduce exactly this kind of short, simple explanation.

In der E-Mail hat sie den Plan vereinfacht erklärt.
In the email, she explained the plan in a simplified way.
Die Aufgabe war einfach, weil alle Schritte klar beschrieben waren.
The task was easy because all the steps were clearly described.