Complex sentence: The group accumulated 14 number-one singles in the United Kingdom (the third-highest in UK history, tying with Cliff Richard and only behind The Beatles and Elvis Presley) and 26 top ten singles over their 14-year career.
Split into simpler sentences: The group accumulated 14 number-one singles in the United Kingdom (the third-highest in UK history), tying with Cliff Richard and ranking just behind The Beatles and Elvis Presley. They achieved a total of 26 top ten singles over their 14-year career.