TASK DEFINITION: In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
PROBLEM: Tim Bergling ( -RSB- ; 8 September 1989 – 20 April 2018 ) , known professionally as Avicii ( , -RSB- ) , was a Swedish DJ , electronic musician , and songwriter who specialized in audio programming , remixing and record producing .

SOLUTION: Tim Bergling ( -RSB- ; 8 September 1989 – 20 April 2018 ) , known professionally as Avicii , was a Swedish musician , DJ , remixer , and record producer .

PROBLEM: A fad , trend , or craze is any form of collective behavior that develops within a culture , a generation or social group in which a group of people enthusiastically follow an impulse for a finite period .

SOLUTION: A trend or a fad is a type of behavior that develops in a large population .

PROBLEM: He was a member of the prominent Kennedy family , and son of actor Peter Lawford and Patricia " Pat " Kennedy Lawford , who was the sister of President John F. Kennedy .

SOLUTION:
He was the son of actor Peter Lawford and Patricia Kennedy Lawford .