Complex sentence: This is 6 hours and 9.1626 minutes "longer" than the standard calendar year of 365 SI days, and 20 min 24.5128 s "longer" than the mean tropical year at J2000.0.
Split into simpler sentences: This is 6 hours and 9.1626 minutes "longer" than the standard calendar year of 365 SI days. The sidereal year is 20 min 24.5128 s "longer" than the mean tropical year at J2000.0.