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Description of the problem

I copy-pasted Skosmos Turtle output into http://ttl.summerofcode.be and it does parse, nor does it with Jena's riot

The error:

Expected punctuation to follow "https://data.beamery.com/aaa/bbb/ccc/1287" on line 14.

The relevant bit of data looks like this:

@prefix smth: <https://data.beamery.com/aaa/bbb/ccc/> .

... skos:relatedMatch smth:1287#this

I don't think the prefix:local-name#fragment syntax is valid. You should look into the RDF I/O library that is producing this.