Complex sentence: It was released on 11 May 1998 and reached the top five of the UK Singles Chart in December 1998 and number one on the UK R&B Chart, and was their longest charting single, spending 14 weeks in the Top 75.
Split into simpler sentences: It was released on 11 May 1998 and reached the top five of the UK Singles Chart in December 1998. It also got to number one on the UK R&B Chart, and was their longest charting single, spending 14 weeks in the Top 75.