Complex sentence: Italy also had an apparent goal scored in extra time invalidated due to a similarly controversial offside, although it was Moreno's assistant who was responsible for nullifying the goal (assistant referees are responsible for calling offsides).
Split into simpler sentences: Italy also had an apparent goal scored in extra time invalidated due to a offside. It was Moreno's assistant who was responsible for nullifying the goal (assistant referees are responsible for calling offsides).