how to receive data from gps neo-6m module to uar1 of stm32f103c6 and then display the data using another uart2 configuartion and HAL is very difficult to understand is it possible using only interrupts

If you don't like the HAL, consider using the older SPL, or using register level methods.

Yes, could be done with interrupts. With HAL you'd use this via callbacks to manage a holding buffer, and dispatch to the other USART.

I have posted GPS examples to prior threads, perhaps dig a little.