Complex sentence: Like all auto loading firearms, most semi-automatics are also prone to jamming, on the feeding cycle when the cartridge gets stuck while entering the firing chamber or on the ejection cycle when the fired casing gets stuck while exiting the chamber.
Split into simpler sentences: Like all auto loading firearms, semi-automatics are also prone to jamming. This can happen during the feeding cycle when the cartridge gets stuck while entering the firing chamber, or during the ejection cycle when the fired casing may become stuck while exiting the chamber.