Simplify the following text for a Grade 7 native English-speaking person.
Original: For example , a horse skeleton unearthed in the Sinai peninsula , dated to 1700 BC , is considered the earliest physical evidence of the horse in Ancient Egypt .
Simplified: A horse skeleton was unearthed in the Sinai peninsula , dated to 1700 B.C. , and is considered the earliest proof of the horse in Ancient Egypt .