See Patrick Hurley, A Concise Introduction to Logic, Ch.16 Extended Arguments :
The logical analysis of extended arguments, such as those found in editorials, essays, and lengthy letters to newspaper editors, involves numerous difficulties. Such arguments are often mixed together with fragments of reports, pieces of expository writing, illustrations, explanations, and statements of opinion. Proper analysis involves weeding out the extraneous material and isolating premises and conclusions. Another problem stems from the fact that lengthy arguments oft en involve complex arrangements of subarguments that feed into the main argument in various ways. Distinguishing one subargument from
another is oft en a complicated task.
To facilitate the analysis of extended arguments, we will assign numerals to the various statements in the passage and use arrows to represent the inferential links.
(1) seems weakly related.
The argument can be analyzed into : premise (3), conclusion (2).
The whole observable universe is not large enough to contain the necessary monkey hordes, the necessary typewriters and certainly the waste paper basket required for the deposition of wrong attempts.
[Therefore,] troops of monkey thundering away at random on typewriters could not produce the works of Shakespeare.
Probably, we may say that the above argument support the general conclusion:
[Thus,] no matter how large the environment one considers, the origin of life cannot be a random process.