Help with code

I am trying to run this code. Both loops should run the same thing but on different led's and different sensors. It actually ran the first void loop properly but when i started adding code to do it a second time on different sensors and led's is when I began getting errors.

int threshold = 50; 
int ledGreen = 8;
int ledRed = 7;
int ledGreen1 = 12;
int ledRed1 = 13;
int threshold1 = 50;
long randNumber;
boolean sensorTrig = false;

void setup() {
 Serial.begin(9600);
 pinMode(ledGreen, OUTPUT);
 pinMode(ledRed, OUTPUT);
 pinMode(ledGreen1, OUTPUT);
 pinMode(ledRed1, OUTPUT);
}
 
void loop() {
  int sensorValue = analogRead(A0);
  //Serial.println(sensorValue);
  delay(10);
  
  if (sensorValue < threshold){
    if (!sensorTrig) {
      randNumber = random(9);
      sensorTrig = true;
    }
    Serial.println(randNumber);
      if (randNumber < 5){
        digitalWrite(ledGreen, HIGH);
      }
      else if (randNumber > 4){
        digitalWrite(ledRed, HIGH);
      }
  }
  else{
  sensorTrig = false;
  digitalWrite(ledGreen, LOW);
  digitalWrite(ledRed, LOW);
  }
}

  void loop() {
  int sensorValue1 = analogRead(A1);
  //Serial.println(sensorValue);
  delay(10);
  
  if (sensorValue1 < threshold1){
    if (!sensorTrig) {
      randNumber = random(9);
      sensorTrig = true;
    }
    Serial.println(randNumber);
      if (randNumber < 5){
        digitalWrite(ledGreen1, HIGH);
      }
      else if (randNumber > 4){
        digitalWrite(ledRed1, HIGH);
      }
  }
  else{
  sensorTrig = false;
  digitalWrite(ledGreen1, LOW);
  digitalWrite(ledRed1, LOW);
  }
}

You can't have two loops, just combine them together.

You can re-name your two 'loop()' functions and call them from a master loop() function:

int threshold = 50; 
int ledGreen = 8;
int ledRed = 7;
int ledGreen1 = 12;
int ledRed1 = 13;
int threshold1 = 50;
long randNumber;
boolean sensorTrig = false;

void setup() {
 Serial.begin(9600);
 pinMode(ledGreen, OUTPUT);
 pinMode(ledRed, OUTPUT);
 pinMode(ledGreen1, OUTPUT);
 pinMode(ledRed1, OUTPUT);
}
 
void loop() {
  loop1();
  loop2();
}

void loop1() {
  int sensorValue = analogRead(A0);
  //Serial.println(sensorValue);
  delay(10);
  
  if (sensorValue < threshold){
    if (!sensorTrig) {
      randNumber = random(9);
      sensorTrig = true;
    }
    Serial.println(randNumber);
      if (randNumber < 5){
        digitalWrite(ledGreen, HIGH);
      }
      else if (randNumber > 4){
        digitalWrite(ledRed, HIGH);
      }
  }
  else{
  sensorTrig = false;
  digitalWrite(ledGreen, LOW);
  digitalWrite(ledRed, LOW);
  }
}

  void loop2() {
  int sensorValue1 = analogRead(A1);
  //Serial.println(sensorValue);
  delay(10);
  
  if (sensorValue1 < threshold1){
    if (!sensorTrig) {
      randNumber = random(9);
      sensorTrig = true;
    }
    Serial.println(randNumber);
      if (randNumber < 5){
        digitalWrite(ledGreen1, HIGH);
      }
      else if (randNumber > 4){
        digitalWrite(ledRed1, HIGH);
      }
  }
  else{
  sensorTrig = false;
  digitalWrite(ledGreen1, LOW);
  digitalWrite(ledRed1, LOW);
  }
}