how to make 2 separate substrings from strsplit in R

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When it comes to accessing the elements in a list or dataframe, the difference between bracket [] and double bracket [[]] is significant (11 answers)
1 year ago, this business was closed.
I'm having trouble dividing a string using strsplit in R to create two independent strings. I realise this is probably a basic request, but I'm having trouble finding an answer.

I have an x string that looks like this:

"1.23e+05,1.3e+05"
I attempted to separate it using the following code:

str split - strsplit(x,split=',', fixed=TRUE) appears to create a list of length 1 with the following characters: "1.23e+05" "1.3e+05"

However, when I use str split[1] to subset this, it just returns the entire thing.

What is the simplest way to extract two substrings from this data?