Simplify the following text for a Grade 9 native English-speaking person.
Original: The worldwide success of the band 's previous album , Blood Sugar Sex Magik ( 1991 ) , caused guitarist John Frusciante to become uncomfortable with their status , eventually quitting mid-tour in 1992 .
Simplified: John Frusciante had left the band after their previous album , Blood Sugar Sex Magik , so Dave Navarro joined as the new guitarist .