Find & replace in unusual data

I have a column of data in one of the following 4 formats:
n (n) eg: 6 (1)
nn (n) eg: 17 (3)
n (nn) eg: 8 (13)
nn (nn) eg: 15 (12)

I want to separate the two elements into 2 columns and convert from text to number format. Using the first eg above the two elements would be 6 and 1.

I'm trying copying columns and then using find and replace with wildcards but struggling. Any help genuinely very gratefully received.

find replace " )" with nothing
then data/text to columns use "space" and "( "as delimiters
click finish
or
in b1 =LEFT(A1,FIND("(",A1)-1)+0
and c1 =SUBSTITUTE(MID(A1,FIND("(",A1)+1,255),")","")+0
then copy columns b and c paste back/ special /values