Complex sentence: For the orbit of the Earth, this is called the "longitude of perihelion", and in 2000 it was about 282.895 °; by the year 2010, this had advanced by a small fraction of a degree to about 283.067 °.
Split into simpler sentences: For the orbit of the Earth, this is called the "longitude of perihelion", and in 2000 it was about 282.895 °. By the year 2010, this had advanced by a small fraction of a degree to about 283.067 °.