Complex sentence: As established in the episode "Movements of Fire and Shadow", jumpgates are basically considered neutral territory; it is considered a gross violation of rules of engagement to attack them directly, as the jumpgate network is needed by every spacefaring race.
Split into simpler sentences: As established in the episode "Movements of Fire and Shadow", jumpgates are considered neutral territory. It is considered a gross violation of rules of engagement to attack jumpgates directly, as the gate network is needed by every spacefaring race.