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I would not prune anything off that is not completely dead. I see signs of overwatering and fungal infection, both, in the Sago and the Sansevieria. I would absolutely treat with a fungicide, and only water when the area is quite dry. You may not even have to water at all, since they are both pretty drought tolerant. They will suffer if the soil stays wet, though. The only thing that I would say with the Sago is that it can be watered as it dries out until it gets established.

From here, it may be lost, unfortunately. I wouldn't give up just yet, though. You could get lucky and it shoot a pup off of the side, which could take over. If any of the new fronds are nice and healthy, then that is a good sign. If they new fronds come out brown, or injured, then it may signify that it is dying off. If you can, you may want to pull it out of the soil just a little. You want the crown above the soil line, or it will definitely rot. ONLY the roots should go under the soil.

https://www.gardeningknowhow.com/ornamental/trees/sago-palm