Craik and Tulving's research using sentences of different complexity suggested that

complex sentences

a. produce more elaboration, which leads to better retention of the information that is
presented.
b. produce more elaboration, which leads to less distinctive memories.
c. are more difficult to recall than simple ones.
d. do not produce adequate mental imagery for the precise recall of complex information.
e. require the use of both long-term and short-term memory, resulting in less precise recall of
the information than simple sentences.

a. produce more elaboration, which leads to better retention of the information that is
presented.