Complex sentence: According to astrological theory Earth signs are realistic, cautious, hard-working and dependable people with the ability to rise steadily to positions of power and control, but said at their worst to be highly materialistic, limited in outlook, and inhibited.
Split into simpler sentences: According to astrological theory, they are realistic, cautious, hard-working, and dependable people with the ability to rise steadily to positions of power and control. However, at their worst, they are said to be highly materialistic, limited in outlook, and inhibited.