Are there any existing complex use case examples leveraging GraQL and Grakn beyond the example on github? https://github.com/graknlabs/examples/tree/master/python/queries
There are three main places to look for examples on Grakn:
You might also want to check out the BioGrakn project, which augments multiple biomedical datasources and looks for insights across the knowledge graph created. There are blog posts on that too.