Complex sentence: It is common for chalazions to be mistaken for styes if you have constent styes that are becoming more frequent and painful then it is possible that you have a chalazion and it is recommended that you visit your doctor.
Split into simpler sentences: It is common for chalazions to be mistaken for styes. If you have constant styes that are becoming more frequent and painful then it is possible that you have a chalazion and it is recommended that you visit your doctor.