Simplify the following text for a Grade 13 native English-speaking person.
Original: World championship leader Lewis Hamilton commented that it was twice as hard to negotiate as the more famous Monaco street circuit , and unexpectedly physical - requiring double the amount of energy over a single lap as compared to the Monaco circuit .
Simplified: Lewis Hamilton commented that it was twice as hard to negotiate as the Monaco street circuit , and very physical - requiring twice the amount of energy over a single lap .