The frame "Scalar_position2" frame is being evoked by the words "kam voran". As there is no single node of the syntactic structure that covers these words, the edge for the frame-evoking element is split.
While the annotators decided that the word "demonstrieren" evokes the frame "Evidence", they found no appropriate frame element in FrameNet for the agent who produces the evidence, here instantiated by the words "dessen Geschäftsleute". So they tagged these words as "Missing FE".
Currently FrameNet does not contain any frame that would be appropriate for the word "steckt" of this sentence. So it has been assigned an "Unknown" frame. Still the core frame elements present have been marked as Fe1 and Fe2.