Complex sentence: Liverpool had a third goal disallowed in the 89th minute; substitute Sinama Pongolle's goal was disallowed after the assistant referee had flagged García as being offside in the build-up to the goal.
Split into simpler sentences: Liverpool had a third goal disallowed in the 89th minute. Substitute Sinama-Pongolle's goal was disallowed after the assistant referee had flagged García as being offside in the build-up to the goal.