Complex sentence: The Maturidis state that belief ("iman ") does not increase nor decrease but remains static; it is piety ("taqwa") which increases and decreases while the Ash'aris say that belief does in fact increase and decrease.
Split into simpler sentences: The Maturidis state that belief ("iman ") does not increase nor decrease but remains static; it is piety ("taqwa") which increases and decreases. The Ash'aris say that belief does in fact increase and decrease.