Complex sentence: Struggling under stagflation and an, American subcompact sales slumped and AMC was not immune, having only sold 56,011 Gremlins in the (albeit shortened) 1975 model year, a 67% drop.
Split into simpler sentences: Struggling under stagflation and an, American subcompact sales slumped. AMC sold 56,011 Gremlins in the (albeit shortened) 1975 model year, a 67% drop.