Complex sentence: The development of the game started before the completion of the original and its development caused the cancellation of Black Isle Studio's Fallout 3, like Fallout 3, the game was near completion when it was canceled.
Split into simpler sentences: The development of the game started before the completion of the original and its development caused the cancellation of Black Isle Studio's Fallout 3. Like Fallout 3, the game was near completion when it was canceled.