Complex sentence: According to Neil Michelsen's "The American Ephemeris," on 24 August 1987 there was an exceptional, alignment of planets in the solar system, eight (out of ten) planets were aligned in an unusual configuration called a grand trine.
Split into simpler sentences: According to Neil Michelsen's "The American Ephemeris," on 24 August 1987 there was an exceptional alignment of planets in the solar system. Eight (out of ten) planets were aligned in an unusual configuration called a grand trine.