Simplify the following text for a Grade 14 native English-speaking person.
Original: Torvalds used and appreciated MINIX , but his design deviated from the MINIX architecture in significant ways , most notably by employing a monolithic kernel instead of a microkernel .
Simplified: Torvalds used and appreciated MINIX , but his design was different from the MINIX architecture in significant ways , most notably by employing a monolithic kernel instead of a microkernel .