Complex sentence: By coincidence, it is fairly easy to establish that during most of this two-week period Otero was in Denver, where his father had just been swindled out of $2,400 by Doc Baggs, a notorious con man.
Split into simpler sentences: By coincidence, it is fairly easy to establish that during most of this period Otero was in Denver. Otero's father had just been swindled out of $2,400 by Doc Baggs, a notorious con man.