This paper provides an overview of the Task 2: What is unclear? of the Automatic Simplification of Scientific Texts (SimpleText) lab, run as part of CLEF 2022. The main aim of the SimpleText lab is to promote a more open scientific information access via automatic text simplification. Task 2 focuses on complexity spotting within scientific texts (passage). Thus, the goal is to detect the terms/concepts that require specific background knowledge for understanding of the passage and to assess their complexity for non-experts. Overall, four runs from four different teams have been submitted to this task. In this paper, we describe the data collection, the task setup, and the evaluation procedure. We also give a brief overview of the participating approaches.