Simplify the following text for a Grade 1 native English-speaking person.
Original: Males grow up to a body length of 3 m long and weigh up to 135 k. Females reach a body length of up to 1.1 m long and weigh up to 35 k. Tails can be from 0.9 t long . The average Red Kangaroo stands approximately 1.5 m tall .
Simplified: Males grow up to 1.5 m tall and weigh up to 85 k. Females are 1.1 m tall and weigh up to 35 k. The tails is about 1 m long .