Here's a single adapter solution (USB-C to dual-link DVI) that IS working on my 16" MacBook Pro and my 30" Apple Cinema Display:
Club 3D CAC-1510 USB Type C to DVI-D Dual Link Active Adapter, 3840 X 2160 @ 30Hz, 2560 X 1600P @ 60Hz, Deep Color 12 Bit
The adapter is plugged into one of the MBPs four USB-C ports, and of course the Cinema Display's DVI plug is plugged into the adapter. There's no need to connect the ACD's USB-A cable (unless you want to use its USB ports as a hub).
After normal timeout sleep of the Mac, it takes about 6 seconds for the ACD to show the screen, noticeably longer than when I had it connected through the Apple TB2 adapter to my old iMac.
System Preferences seems to think the ACD's native reso is 1280 x 800, but option-click on ()Scaled brings up the 2560 x 1600 option, which works fine. I'm definitely getting 2560 x 1600 (although everything seems huge now compared to the MBP 16 built-in display, even when I knock its reso down to "looks like 1536 x 960").
Aside: a small downside compared to my iMac is that plugging anything into the MBP's right-hand USB-C ports puts the cables in front of my ADC screen.
I previously tried the Accell Mini DisplayPort to DVI adapter like the one Andreas used, into an Other World Computing Dock display port, which lit the ADCs backlight and it showed up in System Preferences, but no picture at all. I returned the Accell--I'm not sure if it really didn't work or I would have needed one of the other adapters above. The OWC USB-C Dock is otherwise working great, although I picked it knowing it didn't have full power to charge the 16" MPB. It was OWC support that suggested there would be a USB-C/DVI adapter now.
Update 9 Jan 2020: After a few weeks with no problems, the Mac frequently wakes up in a mode where the built-in display flashes on and off and the ACD shows nothing. Can't say whether the Club adapter is causing this but it doesn't happen when not connected. Rebooting allowed me to reconnect successfully.