Simplify the following text for a Grade 12 native English-speaking person.
Original: Under the influence of a trough of low pressure , the depression turned northward , and after steadily becoming better organized it transitioned into Tropical Storm Chris by late on September 10 .
Simplified: Under the control of another low pressure system , the depression turned north , and after slowly becoming better organized it strengthened into Tropical Storm Chris on September 10 .