Complex sentence: Thomson effect, and the successful results he obtained led him to build at the Royal Institution a large regenerative cooling refrigerating machine and using this machine in 1898, liquid hydrogen was collected for the first, solid hydrogen following in 1899.
Split into simpler sentences: Thomson effect, and the successful results he obtained led him to build at the Royal Institution a large regenerative cooling refrigerating machine. Using this machine in 1898, liquid hydrogen was collected for the first time, solid hydrogen following in 1899.