First sentence is fine. Second sentence could either be: "He feels comfortable in such conditions" or "He feels more comfortable in these conditions". Based on the context of the photo linked, it would sound more natural to say: "He must be tired from working. This is how he likes to relax." Hope this helps.

You could say: "He's tired from work and he wants to have a rest. He feels comfortably in these conditions" I would probably say: "He's tired from work and wants to take a rest. He feels comfortably in this situation" (or "environment" instead of situation)

Good job guys! Mahdieh, Iran: He's tired of work and he wants to rest (have a rest). He feels comfortable in such a condition. walkabout123, US: He's tired from working so much, and wants to rest. He feels comfortable in these conditions. Austin, US: He's tired from work and he wants to have a rest. He feels comfortably in these conditions. Jason Crook, Ireland: He's tired from work and he wants to have rest. He feels comfortable in such conditions or He feels more comfortable in these conditions. Thank you so much my friend!

Dave! Your explanation is difficult.

Hello John :) he's tired of ( not from)work and he wants to rest. or if you want to use have, you can say have a break/have a rest . he feels comfortable in such a condition.