Complex sentence: It can be said that ipchains is not aware of the full context from which a data packet arises, whereas iptables is, and therefore iptables can make better decisions on the fate of packets and connections.
Split into simpler sentences: It can be said that ipchains is not fully aware of the context from which a data packet arises, whereas iptables is. Therefore, iptables can make better decisions on the fate of packets and connections.