Complex sentence: The Monster was originally intended to play from a first-person perspective but was later shifted to a third-person perspective because the first-person control system was considered to be clumsy and confusing, and that the first person perspective took control away from players.
Split into simpler sentences: The monster was originally intended to play from a first-person perspective. However, they later shifted it to a third-person perspective because the first-person control was clumsy and confusing, and they thought that such perspective took away controls from players.