If those become common enough, then you have reduced your symbols from 50 (your first example) to 11 (your second) where five ("in the and in the") are typical joining words. We can imagine password crackers can just combine the words in the dictionary just like they currently combine letters and give a higher priority to looking for combinations of conjunctions. The random letters make these approaches a lot more difficult.
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If those become common enough, then you have reduced your symbols from 50 (your first example) to 11 (your second) where five ("in the and in the") are typical joining words. We can imagine password crackers can just combine the words in the dictionary just like they currently combine letters and give a higher priority to looking for combinations of conjunctions. The random letters make these approaches a lot more difficult.