The phrase "a complex task for" is correct and usable in written English.
It can be used when describing a challenging assignment or responsibility that is intended for a specific person or group.
Example: "Developing a new software application is a complex task for our development team."
Alternatives: "a challenging task for" or "a difficult assignment for".
Design of bridges is a complex task for civil engineers.
Scene analysis is a complex task for a computer vision system, and therefore requires high level processing tasks.
Responding to a stated preference discrete choice experiment (DCE) is a complex task for respondents to undertake.
The engineering of laminated composite structures is a complex task for design engineers and manufacturers, requiring significant management of manufacturing process and materials information.
Understanding situations occurring within the physical world by analyzing streams of sensor data is a complex task for both human and software agents.
However, identifying those lexical units which belong to a given specific domain is often a complex task for language teachers, where simple introspection or concordance analysis does not really become effective.
The evaluation and prediction of such performances for applications is a complex task, due for example, to the elasticity offered by Cloud resources, or the high number of layers involved.
Learning design, the activity of designing a learning path, can be a complex task, especially for learners.
The design and operation of a packaging filling line is a complex task, calling for a multidisciplinary team, within which each will require a broad understanding, in addition to their own specialist field.
This is, however, a complex task, even for simple theorems like plus_O_r, since the manual writing of proof terms requires knowledge of the CIC type system.
"Sentiment analysis is a very complex task for a machine because of the multiple and often unpredictable soft and hard variables that come into play when interpreting it.
