Complex sentence: Braxton Hicks contractions, also known as false labor or practice contractions, are sporadic uterine contractions that sometimes start around 6 weeks however are not usually felt until the second trimester or third trimester of pregnancy.
Split into simpler sentences: Braxton Hicks contractions, also known as false labor or practice contractions, are sporadic uterine contractions that sometimes start around 6 weeks. However, they are not usually felt until the second trimester or third trimester of pregnancy.