During ingestion of non-natural language text content into a knowledge base, a question answering computing system (QA system) converts the content into natural language text. The QA system identifies natural language sentences in the content and converts the sentences into well-formed simple sentences by resolving grammatical ambiguities in the sentences. The QA system then generates question-answer pairs (QA pairs) from the well-formed simple sentence and stores the QA pairs in a persistent store.