Full Idea
If there is an upper bound on the length of understandable sentences, then two understandable sentences can have an unintelligible conjunction.
Gist of Idea
Two long understandable sentences can have an unintelligible conjunction
Source
Roy Sorensen (Vagueness and Contradiction [2001], 6.4)
Book Reference
Sorensen,Roy: 'Vagueness and Contradiction' [OUP 2004], p.101
A Reaction
Not a huge paradox about the use of the word 'and', perhaps, but a nice little warning to be clear about what is being claimed before you cheerfully assert a screamingly obvious law of thought, such as conjunction.