Complex sentence: The Minissima is a small concept city car that was designed by William Towns (as the Townscar) as his idea for a replacement for the Mini in 1972 and displayed by BLMC on their stand at the 1973 London Motor Show.
Split into simpler sentences: The Minissima is a small concept city car that was designed by William Towns (as the Townscar) as his idea for a replacement for the Mini in 1972. BLMC displayed the car on their stand at the 1973 London Motor Show.