Complex sentence: Of the multiple reports of ghosts in Hammersmith, the Hammersmith Ghost of 1803--4 was especially notorious, causing a great sensation and resulting in a murder trial which established a legal precedent that shooting a supposed ghost was still murder.
Split into simpler sentences: Of the multiple reports of ghosts in Hammersmith, the Hammersmith Ghost of 1803--4 was especially notorious. It caused a great sensation and resulted in a murder trial which established a legal precedent that shooting a supposed ghost was still murder.