Complex sentence: Arsenal's youths also played in the London Minor FA Challenge Cup from 1955 to 1956 as well as 1960 in towards 1967 and the Southern Junior Floodlit Cup which they won in 1956,1972,1975 and 1999.
Split into simpler sentences: Arsenal's youths also played in the London Minor FA Challenge Cup from 1955 to 1956. In 1960 they rejoined the competition where they stayed until 1967 and was also successful in the Southern Junior Floodlit Cup which they won in 1956,1972,1975 and 1999.