Martin Skrtel and Steven Gerrard scored before the interval, with Stewart Downing and Luis Suarez netting after the break.
"You could say if we concede goals like we did you are almost playing against yourself," Jol said.
"We wanted to put them under pressure but we didn't do that in the first half.
"It was as if we had played together for the first time.
"We still have a good cushion (to the bottom three) with 20 points but I feel when everyone is back we will be fine."We have the same points as last year but we have to do better than that."