The complexity of a question can frequently hide unclear thoughts and lead to a confused research process. A very elaborate research question, or a question which is not differentiated into different parts, may hide concepts that are contradictory or not relevant. This needs to be clear and thought-through, but it is one of the hardest parts of your work.
Equally, you may want to begin with your literature review and data collection and you may feel tempted to 'make do' with a broad and vague research question for the moment. However, a muddled question is likely to generate muddled data and equally muddled analysis.
If you create a clear and simple research question, you may find that it becomes more complex as you think about the situation you are studying and undertake the literature review. Having one key question with several sub-components will guide your research here.