Simplify the following text for a Grade 7 native English-speaking person.
Original: Mika HÃ kkinen picked up driver 's championships in 1998 and 1999 , and the team won the constructor 's championship in 1998 .
Simplified: Mika HÃ kkinen won the driver 's championships in the and seasons . The McLaren team won the constructor 's championship in .