Complex sentence: Lucy Rose never played her material for anyone until she left home after completing her A-levels, at 18 she moved to London; but instead of taking her place at UCL she began experimenting and performing with other musicians.
Split into simpler sentences: Lucy Rose never played her material for anyone until she left home after completing her A-levels. At 18 she moved to London; but instead of taking her place at UCL she began experimenting and performing with other musicians.