Complex sentence: The game is based on the works of H. P. Lovecraft, author of "The Call of Cthulhu" and progenitor of the Cthulhu Mythos; the game is a reimagining of Lovecraft's 1936 novella "The Shadow over Innsmouth".
Split into simpler sentences: The game is based on the works of H. P. Lovecraft, author of "The Call of Cthulhu" and progenitor of the Cthulhu Mythos. It is a reimagining of Lovecraft's 1936 novella "The Shadow over Innsmouth".