Complex sentence: In consonant blends, two sounds can be heard e.g. 's' and'n' in snug or'n' and't' in tent, whereas in a digraph two letters are seen but only one sound is heard e.g.'sh' in ship.
Split into simpler sentences: In consonant blends, two sounds can be heard e.g. 's' and'n' in snug or'n' and't' in tent. In a digraph two letters are seen but only one sound is heard e.g.'sh' in ship.