If you don't want to replace the hoses, just the vent, disconnect the hoses at the other ends then pull out the vent and hose to the point you can
work on it. I often use a large channel-locs to break the hose loose from the barbs on the vent. Connect the new vent and push everything back in place.
If you are replacing the hoses and vent then just use a large set of pruning shears to cut the hoses.
John