Complex sentence: Jack has had his share of encounters with the a malevolent force known as the Otherness, often it comes in the form of creatures called rakoshi that tried to kill Vicky (in "The Tomb").
Split into simpler sentences: Jack has had his share of encounters with the a malevolent force known as the Otherness. Jack first encounters were in the form of creatures called rakoshi that tried to kill Vicky (in "The Tomb").