The phrase "a rather complex task" is correct and usable in written English.
You can use it to describe a task that involves multiple steps or requires significant effort and understanding.
Example: "Completing the project on time proved to be a rather complex task due to the numerous challenges we faced."
Alternatives: "a quite complicated task" or "a somewhat intricate task".
The nonlinear character and the usually large number of parameters in biological mathematical models make model identification from experimental data a rather complex task.
Milling composite materials is a rather complex task owing to its heterogeneity and the number of problems, such as surface delamination, that appear during the machining process, associated with the characteristics of the material and the cutting parameters.
However the nonlinear character and the usually large number of parameters make model identification from experimental data a rather complex task due to the multimodal character of the problem and/or the poor practical identifiability.
This indicates that EA parameter adaptation is a rather complex task, and one that is yet to be fully resolved.
In practice, establishing a trusted entity referred to as a certification authority (CA) by using a single node in ad hoc networks is a rather complex task.
Social acceptance is crucial for a successful energy transition, but difficult to assess with indicators because exploring the view of the subject on an object, and measuring different dimensions of acceptance and the influencing factors is a rather complex task and the field of renewable energies is highly diverse.
Be forewarned, this is a rather complex project.
Data are being generated from experimental and field research in AI vaccinology, but the rather complex task of vaccinating poultry in different farming and ecologic environments still has areas of uncertainty.
In order to reliably perform these rather complex tasks related to medical equipment management, hospitals have to establish well-structured programs, usually applying specifically designed medical equipment management systems.
Based on the available literature, it is deemed appropriate to acknowledge that the clinical management of cancer risk in BRCA1 and BRCA2 mutation carriers is a rather complex and stressful task, which should consider individual patients' expectations and preferences.
