Complex sentence: During 1990 Connolly reunited with the original Sweet line-up, for the promotion of a music video documentary in London at Tower Records and again there were rumours of a full band reunion which, ultimately, came to naught.
Split into simpler sentences: During 1990 Connolly again reunited with the original Sweet line-up, for the promotion of a music video documentary in London at Tower Records. Again there were rumours of a full band reunion, which ultimately came to naught.