MPU-6050 with Arduino - postmortem
I think that  AcX, AcY, AcZ, GyX, GyY, GyZ are raw acceleration and gyroscopic values recieved from mpu6050 in the corresponding directions. in order to recieve them a procedure is followed.

 Wire.read();


means two registers are read and stored in the same variable

   accelerometer_x = Wire.read()&lt;&lt;8 | Wire.read(); 


reads registers: 0x3B (ACCEL_XOUT_H) and 0x3C (ACCEL_XOUT_L) that is , 
it deals with bitwise operation to shift the values 8 bits left (multiplying it by 256).
This enables addition ("|" or "ored") of two datas in order to continuously output the accelerometer data !! Without this you would not be able to see the increasing and decreasing sloping values .
Further, the print just displays the instantaneous values on screen.

If you want to go in deapth of the code, you can visit this site for line to line description !! 

https://www.mschoeffler.de/2017/12/09/example-application-gy-521-module-mpu-6050-breakout-board-and-arduino-uno/

 delay(500);


Totally depends on your project, i don't see any forecoming issues if you will make 333 go 500 !! It will just stablize the output on screen there for a bit longer (for .5 seconds)