Working a temprature sensor (LM35) with a GSM module (Sim800L)

I have a temperature sensor set up working with an LCD and a stick to adjust the brightness. I now want the temperature sensor to send a text whenever it reaches a certain temperature. Can somebody please help. The GSM unit i have is the SIM800L below is what I have so far :

#include<LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
const int sensor=A1; // Assigning Analog Pin A1 to variable ‘sensor’
float tempc; //variable to store temperature in degree Celsius
float tempf; //variable to store temperature in Fahrenheit
float vout; //temporary variable to hold sensor reading
void setup()
{
pinMode(sensor,INPUT); // Configuring pin A1 as INPUT Pin
Serial.begin(9600);
lcd.begin(16,2);
delay(500);
}
void loop()
{
vout=analogRead(sensor);
vout=(vout500)/1023;
tempc=vout; // Storing value in degrees Celsius
tempf=(vout
1.8)+32; // Converting Temperature value from degrees Celsius to Fahrenheit
lcd.setCursor(0,0);
lcd.print("DegreeC= ");
lcd.print(tempc);
lcd.setCursor(0,1);
lcd.print(“Fahrenheit=”);
lcd.print(tempf);
delay(1000); //Delay of 1 second for ease of viewing in serial monitor
}

Apart from the fact you have posted code without reading the sticky on 'how to' you have no code for the GSM.

I recommend you read this tutorial with example https://exploreembedded.com/wiki/GSM_SIM800L_Sheild_with_Arduino