# the gospel was preached also to the dead

"the gospel was preached by Christ also to people who had already died" or "men preached the gospel also to those who were alive but are now dead"

# they have been judged in the flesh as humans

"God judged them in their bodies as humans" or "men judged them in their bodies as humans" 

# judged in the flesh as humans

This is a reference to death as the ultimate form of judgment.

# live in the spirit the way God does

"live spiritually as God lives because the Holy Spirit will enable them to do so" or "live according to God's standards by the power of the Holy Spirit"