Simplify the following text for a Grade 5 native English-speaking person.
Original: Dr. Speers is known for having undertaken the endeavor to raise his child bilingually in English and Klingon ; Speers spoke in Klingon and his wife in English .
Simplified: Dr. Speers has tried to teach his child in Klingon ; He only spoke to him in Klingon , and his wife spoke to him in English .