Complex sentence: In 1930, Georg Joos conducted an experiment using an automated interferometer with 21 m long arms forged from pressed quartz having extremely low thermal coefficient of expansion, that took continuous photographic strip recordings of the fringes through dozens of revolutions of the apparatus.
Split into simpler sentences: In 1930, Georg Joos carried out experiments using an automated interferometer with 21-meter-long arms forged from pressed quartz having very low thermal coefficient of expansion. These experiments took continuous photographic-strip recordings of the fringes through dozens of revolutions of the apparatus.