Simplify the following text for a Grade 5 native English-speaking person.
Original: Race start is in the `` Tribunas '' section and features a pretty long straight section , then comes `` S do Senna '' ( `` Senna 's S '' ) ( Turns 1 & 2 ) , a series of turns ( left , right , then left again ) that are considered extremely difficult because each of them has a different angle , a different radius , a different length , a different inclination ( inward or outward ) and a different shape ( besides the terrain goes down and then up again ) .
Simplified: The race start is in front of the `` Tribunas '' section and features a long straight section . Next comes `` S do Senna '' ( Senna 's S ) , a series of left , right , and left turns .