Simplify the following text for a Grade 11 native English-speaking person.
Original: Flamsteed was refusing to publish work that had been commissioned by the king , and in 1712 Newton and Edmond Halley published a preliminary version of Flamsteed 's Historia Coelestis Britannica without crediting the author .
Simplified: Flamsteed was refusing to publish work commissioned by the king , so in 1712 Newton and Edmond Halley published a preliminary version of Flamsteed 's Historia Coelestis Britannica . They did so without crediting the author .