Complex sentence: One of the writers who received it was Alastair Swinnerton, who rewrote the concept and sent it back to Thompson, and was later invited to pitch it to the Lego Group at their headquarters in Billund, Denmark.
Split into simpler sentences: One of the writers who received it was Alastair Swinnerton. He rewrote the concept and sent it back to Thompson, and was later invited to pitch it to the Lego Group at their headquarters in Billund, Denmark.