Complex sentence: But most of the time modern programmers use'foo' and'bar' to check if certain parts of the programs are working correctly, and all functions are executed without encountering any errors, by printing then in different parts of the program.
Split into simpler sentences: But most of the time modern programmers use'foo' and'bar' to check if certain parts of the programs are working fine. And if all functions are executed without encountering any errors just by printing then in different parts of the program.