Complex sentence: The rods may have the form of tubes filled with neutron absorbing pellets or powder etc., can be made out of stainless steel or other neutron window materials like zirconium, chromium, silicon carbide or c 11 B 15 N (cubic boron nitride).
Split into simpler sentences: The rods may have the form of tubes filled with neutron-absorbing pellets or powder. They can be made out of stainless steel or other neutron window materials such as zirconium, chromium, silicon carbide or (cubic boron nitride).