Complex sentence: Brian Hayles was approached to create a suitable monster that could be used as a new recurring antagonist for the Doctor, drawing from both newspaper reports of a baby mammoth being found in 1900 in the Siberian ice and his interest in Mars to create his monster.
Split into simpler sentences: Brian Hayles was approached to create a suitable monster that could be used as a new recurring antagonist for the Doctor. He drew from newspaper reports of a baby mammoth being found in 1900 in the Siberian ice, and from his interest in Mars, to create his monster.