Complex sentence: Lager is beer that has been cool fermented at around (compared to typical warm fermentation temperatures of), then stored for around 30 days at temperatures close to freezing point; during this storage sulphur components developed during fermentation dissipate.
Split into simpler sentences: Lager is beer that has been cool fermented at around, compared to typical warm fermentation temperatures of. It is then stored for 30 days or longer close to the freezing point, and during this storage sulphur components developed during fermentation dissipate.