Complex sentence: Proto managed to gain accesses to the net, where he located Section 9's tachikoma units passed along building blueprints and up to date information on Section 9's Dejima operation.
Split into simpler sentences: Proto managed to gain accesses to the net, where he located Section 9's tachikoma units. Through them Proto was able to gain building blueprints and up to date information on Section 9's Dejima operation.