Can someone help turning this code into 1 single if

if(a <= 6 && a > 4) if(b < 40) if(b < c) return 1; else return 0; else if(c >= a) return 1; else return 0; else if(a == 6) return 1; else if(a == 4) if(c < b) return 1; else return 0; else return 0; return 0;