Complex sentence: Demoralized, Epsilon signaled a retreat towards the vicinity of Campo Grande and his ally Greek Guard to stand and fight at Concepción to the last man in order to gain cover for his troops and of course time for his reinforcements to arrive from North Brazil and Peru.
Split into simpler sentences: Demoralized, Epsilon signaled a retreat towards the vicinity of Campo Grande. He also ordered his ally, Greek Guard, to stand and fight at Concepción to the last man in order to gain cover for his troops and of course gain time for his reinforcements to arrive from North Brazil and Peru.