Original: Shoemaker-Levy 9, at the time captured by and orbiting Jupiter, was located on the night of March 24, 1993, in a photograph taken with the 40 c Schmidt telescope at the Palomar Observatory in California.
Simplified: Shoemaker-Levy 9, was found on the night of March 24, 1993, in a photograph taken with the 40 c Schmidt telescope at the Palomar Observatory in California. At the time it had been captured by Jupiter, and was orbiting around the planet.