The Composite Decorator node enables you to setup more advanced logic than the built in nodes but not as complex as a full Blueprint. Once you have added a Composite Decorator to a node, Double-click the Composite Decorator to bring up the Composite's Graph. By Right-clicking in the graph area you can add Decorator Nodes as stand alone nodes, then wire them together through AND nodes, OR nodes, and NOT nodes, to create more advanced logic:
The name the node should display in the Behavior Tree graph.
This will cause the operations to be listed on the node in plain text.