Complex sentence: Although discovered by LINEAR, 18880ToddBlumberg is not a near-Earth asteroid, given that its closest approach to the Sun (perihelion) is about double the maximum distance of 1.3 AU that qualifies an asteroid as "near-Earth".
Split into simpler sentences: Although discovered by LINEAR, 18880ToddBlumberg is not a near-Earth asteroid. Its closest approach to the Sun (perihelion) is about double the maximum distance of 1.3 AU that qualifies an asteroid as "near-Earth".