Complex sentence: Mormons view this process of doctrinal development as completely foreign to God's established pattern of revealing doctrine through a prophet, the result of which can only be "philosophies of man, mingled with scripture".
Split into simpler sentences: Mormons view this process of doctrinal development as completely foreign to God's established pattern of revealing doctrine through a prophet. When it is not, Mormons see the inevitable result as "philosophies of man, mingled with scripture".