Complex sentence: At the time of her death, Lupe Vélez was extremely popular with the public, exemplified by the more than 4000 people who filed past her casket during funeral services in Glendale, California.
Split into simpler sentences: At the time of her death, Lupe Vélez was extremely popular with the public. Proof of that popularity was found in the more than 4000 people who filed past her casket during funeral services in Glendale, California.