TASK DEFINITION: In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.
PROBLEM: convection increased on august 11 , and by august 12 the interaction between a tropical wave and an upper-level low in the area resulted in a large area of disorganized thunderstorms extending from the western caribbean sea into the central bahamas.

SOLUTION: convection increased and a large area of disorganized thunderstorms extended from the western caribbean sea into the central bahamas.

PROBLEM: it is often responsible for adverse weather throughout the world.

SOLUTION: it 's often responsible for poor weather throughout the world.

PROBLEM: the coat of arms was established about 1350 , when six towns of upper lusatia founded a confederacy.

SOLUTION:
the coat of arms was recognized about 1350 , when six towns of upper lusatia founded a gathering.