Complex sentence: Although the leadership was mainly Dutch, the majority of the network was French, and in close contact with other networks of the Belgian and French resistance to obtain false papers including place for sheltering, food and other services.
Split into simpler sentences: Although the leadership was mainly Dutch, the majority of the network was French. Dutch-Paris was in close contact with other networks of the Belgian and French resistance to obtain false papers including place for sheltering, food and other services.