You can start from hearing assessment. If other milestones are normal, this aspect becomes important.

Consult with Pediatrician physically for further evaluation and treatment

At 2yrs old 2 word sentences needs to speak Kindly consult for further management

At a minimum, he  should communicate using two words together. If that doesn't happen, please seek the advice of a developmental pediatrician

"It's completely understandable to be concerned about your son's speech development. It's great that he understands so much, responds to his name, and interacts well with other children – these are all very positive signs, indicating good receptive language and social development. However, at 2 years old, most children are typically using more words (around 50 or more) and starting to put two words together. His limited vocabulary and difficulty repeating words properly suggest that while his understanding is good, his expressive language might be delayed. While this could simply be a developmental speech delay, which is common, it's always best to rule out any underlying issues. I strongly recommend you consult with your pediatrician as soon as possible.