Complex sentence: Nearly all known Aten asteroids have their aphelion greater than one AU; the only two known exceptions (as of May 2004) are 2003 CP20 and 2004 JG6.
Split into simpler sentences: Nearly all known Aten asteroids have their aphelion greater than one AU. As of May 2004 there are only two known Apoheles: 2003 CP20 and 2004 JG6.