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Modern applications are often driven by user interactions and user triggered events. Traditional event handling logic using imperative code and the observer pattern can quickly become complex and error-prone. Reactive programming frameworks try to solve this by simplifying specification of event handling and dataflow. Although modern reactive frameworks can improve the event handling experience a lot, they still lack expressiveness for more complex events. When handling such event, a fallback to imperative code and observers is often needed. In this thesis we extend the ReScala framework with so-called reactors to provide a simple tool for complex event processing in a reactive context. Reactors embed imperative code into a reactive object, which changes state depending of series and combinations of events.