Complex sentence: This traps phosphates; which are needed to phosphorylate glycogen phosphorylase which carries on to release units of glucose-1-phosphate from glycogen which gets converted to glucose-6-phosphate and then dephosphorylated to form glucose.
Split into simpler sentences: This traps phosphates; which are needed to phosphorylate glycogen phosphorylase which carries on to release units of glucose-1-phosphate from glycogen. Glucose-1-phosphate gets converted to glucose-6-phosphate and then dephosphorylated to form glucose.