Complex sentence: His birth name was Eric Lee Kirkland or Erik Lee Kirkland, as his true paternity was not known to him until he was an adult, so he was named by his mother Gypsy Rose Lee and her then-husband, Alexander Kirkland.
Split into simpler sentences: His birth name was Eric Lee Kirkland or Erik Lee Kirkland. His true paternity was not known to him until he was an adult, so he was named by his mother Gypsy Rose Lee and her then-husband, Alexander Kirkland.