Complex sentence: Caniff (asteroid 17305) is a main belt asteroid that was discovered on September 24,1960 by C. J. van Houten and I. van Houten-Groeneveld.
Split into simpler sentences: Caniff (asteroid 17305) is a main belt asteroid. This asteroid was discovered on September 24,1960 by C. J. van Houten and I. van Houten-Groeneveld.