Because the length scales of these microstructural features coincide with the fundamental physical processes responsible for a material's properties (e.g. strength, electrical conductivity, magnetic behaviour, etc.) they have a profound effect on these properties.
(they; have; a profound effect on these properties) Context(they have,List([216, 225))):(the length scales of these microstructural features; coincide; )
they have,List([216, 225))
they the length scales of these microstructural features
have coincide
a profound effect on these properties