TASK DEFINITION: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
PROBLEM: Billy McKee ( ; 12 November 1921 – 11 June 2019 ) was an Irish republican .

SOLUTION: Billy McKee ( ; 12 November 1921 – 11 June 2019 ) was an Irish republican and a founding member and leader of the Provisional Irish Republican Army ( PIRA ) .

PROBLEM: The 1950s was the decade that started on January 1 , 1950 , and ended on December 31 , 1959 .

SOLUTION: The 1950s ( pronounced " nineteen-fifties " ; commonly abbreviated as the fifties ( among other variants ) ) was a decade of the Gregorian calendar that began on January 1 , 1950 , and ended on December 31 , 1959 .

PROBLEM: The Communist Party of India ( Marxist ) is a Communist party in India .

SOLUTION:
The Communist Party of India ( Marxist ) ( abbreviated CPI ( M ) ) is a communist political party in India adheres to Marxist – Leninist theory .