To actively engage readers in the text they are reading and maintain their interest in the topic, texts needs to be on an adequate level for the reader in terms of its lexical, syntactic, as well as its conceptual complexity (McNamara et al., 2006).
in the current implementation, we use DBpedia Spotlight (Daiber et al., 2013) which is freely available for several languages (DBpediaSpotlight, 2019).