Complex sentence: The Harmonic Convergence is the name given to one of the world's first globally synchronized meditation events, which occurred on August 16--17,1987, which also closely coincided with an exceptional alignment of planets in the Solar System (see Astrological alignment below).
Split into simpler sentences: The Harmonic Convergence is the name given to one of the world's first globally synchronized meditation events, which occurred on August 16--17,1987. This event also closely coincided with an exceptional alignment of planets in the Solar System (see Astrological alignment below).