Complex sentence: They would later be joined by Liam's older brother Noel Gallagher (lead guitar and vocals) as a fifth member, becoming the band's settled line-up until April 1995.
Split into simpler sentences: They would later be joined by Liam's older brother Noel Gallagher (lead guitar and vocals) as a fifth member. This would be the band's complete and established line-up until April 1995.