String example = "lec dwm> DIST,1,AN0,373D,1.63,5.09,15.49,0.20 DIST,1,AN0,373D,1.63,5.09,15.49,0.21 DIST,1,AN0,373D,1.63,5.09,15.49,0.00";

char *split(char *str, const char *delim)
{
  char *p = strstr(str, delim);

  if (p == NULL) return NULL;     // delimiter not found

  *p = '\0';                      // terminate string after head
  return p + strlen(delim);       // return tail substring
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  char *tail;

  tail = split(example, "DIST");

  if (tail) {
    Serial.println("head:");
    Serial.println(example);
    Serial.println("tail: ");
    Serial.println(tail);
  }
}

void loop() {
  // put your main code here, to run repeatedly:

}