Complex sentence: Karen Billings, an overworked, very underappreciated secretary, in her attempt to make copies for her overdemanding boss, using a malfunctioning Xerox machine, finds herself transported to another reality.
Split into simpler sentences: Karen Billings, an overworked, very underappreciated secretary, attempts to make copies for her overdemanding boss. She tries using the office Xerox machine, but it malfunctions and Karen finds herself transported to another reality.