Complex sentence: Miller has collaborated with his brother Roger Miller from time to time, particularly on the M3 project, named for the three Miller brothers, but he has collaborated with his twin Laurence most consistently over the years, particularly through the 1980s and early 1990s.
Split into simpler sentences: Miller has collaborated with his brother Roger Miller on the M3 project, named for the three Miller brothers. Miller collaborated with his twin Laurence particularly through the 1980s and early 1990s.