**Original Text:**
“The inherent complexity and multifactorial nature of COVID-19 pose significant challenges in determining its root cause. Moreover, the dynamic evolution of the virus adds an additional layer of uncertainty, making it imperative to continuously monitor and adapt our understanding.”
**Simplified Text:**
Understanding why COVID-19 happens is difficult because it’s a complex illness with many factors contributing to it. Additionally, the virus keeps changing, which makes it hard to know for sure what’s causing it. Because of this, we need to keep watching the virus and learning more about it all the time.