# we deliberately go on sinning

"we know we are sinning but we do it again and again"

# after we have received the knowledge of the truth

"after we have learned the truth about God" 

# a sacrifice for sins no longer remains

"no one can offer a sacrifice for which God will forgive our sins" 

# a sacrifice for sins

Here "sacrifice for sins" stands for "an effective way to sacrifice animals to take away sins"