problematisch
problematic
Causing difficulties or problems; complicated and not easy to solve.
Die finanzielle Situation des Unternehmens ist zunehmend problematisch.
The company's financial situation is becoming increasingly problematic.

problematic
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problematic
Causing difficulties or problems; complicated and not easy to solve.
Die finanzielle Situation des Unternehmens ist zunehmend problematisch.
The company's financial situation is becoming increasingly problematic.

The adjective 'problematisch' (problematic) is derived directly from 'das Problem' (problem). If a thing or situation is problematic, it means that it represents a problem or is associated with difficulties.
Die neue Software ist in der Anwendung noch etwas problematisch.
The new software is still somewhat problematic to use.
'Problematisch' (problematic) is often used in constructions with verbs of evaluation. Typical patterns are 'etwas als problematisch ansehen' (to regard something as problematic), 'etwas als problematisch empfinden' (to perceive something as problematic), or 'etwas für problematisch halten' (to consider something problematic).
Ich halte sein Verhalten in dieser Angelegenheit für problematisch.
I consider his behavior in this matter problematic.
Whether a technical difficulty (meaning 1) or a moral concern (meaning 2) is meant is shown by the context. With logistics or technology, the first meaning is usually meant; with opinions and behavior, often the second.
Die Wasserversorgung in der Region ist problematisch.
The water supply in the region is problematic.
In the meaning 'morally questionable,' 'problematisch' (problematic) is often combined with things that express opinions or attitudes. Typical collocations are 'problematische Ansichten' (problematic views), 'problematische Aussagen' (problematic statements), or 'problematisches Verhalten' (problematic behavior).
Solche pauschalen Urteile sind immer problematisch.
Such sweeping judgments are always problematic.
simple / just
'einfach' and 'problematisch' are opposites here. You use 'einfach' when something is easy to understand, easy to do, or free of major difficulties. You use 'problematisch' when something causes difficulties or is not easy to solve. So the difference is whether something is clear and easy, or whether it causes problems.

Der neue Plan ist problematisch, weil er viel zu wenig Zeit lässt.
The new plan is problematic because it leaves far too little time.
Im Kurs haben wir heute eine einfache Übung gemacht.
In the course today, we did a simple exercise.