Complex sentence: In the formation lap Jolyon Palmer suffered a hydraulic failure and needed to retire, after this, antoher formation lap was held and thus the grand prix was shortened to 51 instead of the scheduled 52 laps.
Split into simpler sentences: In the formation lap Jolyon Palmer suffered a hydraulic failure and retired from the race. Another formation lap was held and thus the grand prix was shortened to 51 laps instead of the scheduled 52 laps.