Complex sentence: Since the mid 20th century, approximation of has been the task of electronic digital computers; the current record (as of 2014) is at 12.1 trillion digits, calculated in 2013.
Split into simpler sentences: Since the mid 20th century, approximation of has been the task of electronic digital computers. The current record (as of 2014) is at 12.1 trillion digits, calculated in 2013.