Simplify the following text for a Grade 12 native English-speaking person.
Original: K-Swiss was founded in 1966 in Los Angeles , California , by the two Swiss brothers Art and Ernie Brunner who became interested in tennis after immigrating to the United States , where they introduced the first leather tennis shoes .
Simplified: K-Swiss was founded in 1966 in Los Angeles , California , by two Swiss brothers who became interested in tennis after immigrating to the United States , where they introduced the first leather tennis shoes .