Complex sentence: In 1283, the ex-queen gave her income in the fishing of Norrköping to the Saint Martin Abbey in Skänninge, which is the first document were the city of Norrköping is mentioned.
Split into simpler sentences: In 1283, the ex-queen gave her income in the fishing of Norrköping to the Saint Martin Abbey in Skänninge. This is the first document were the city of Norrköping is mentioned.