Maintaining your concentration through over an hour of night prayers (Taraweeh) can be challenging, especially if you don’t understand classical Arabic.

1-Do sincere dua' just before Iftar and also after Isha prayer beseeching Allah to help you to concentrate in the Taraweeh in particular and salaah in general. 
Mu`adh (Radi'Allahu anhu) reported: The Messenger of Allah (Sall'Allahu alaihi wasallam) took hold of my hand and said:
"O Mu`adh! By Allah I love you, so I advise you to never forget to recite after every prayer:"Allahumma a`inni ala dhikrika, wa shukrika, wa husni `ibadatika " (O Allah, help me remember You, to be grateful to You,  and to worship You in an excellent manner).'' [Abu Dawud]

2-Another way to change this is to look over the translation of the next portion to be recited (during the day before the taraweeh), so that you can have a sense of what’s being recited and can ponder over its meaning and implications.

3-You can also try focusing on specific words that you understand and think about how they relate to Islam, Allah and you. 

4-Also, before each rakah, remind yourself of the immense reward for performing taraweeh prayers properly.

5-Think that this could be your last Taraweeh! And that Allah is watching us pray.

6-Dont eat too much or heavy/oily and spicy food at Iftaar or before Taraweeh! 
Imam Ghazali says in his 'Ihya': "One should let a certain degree of weakness carry over into the  night, making  it  easier  to  perform the  night  Prayers and to recite the litanies (awraad). It may then be that Satan will not hover around one's heart, and that one will behold  the Kingdom  of Heaven. Anyone who puts a bag of food between his heart and his breast becomes blind to this (divine) revelation."

May Allah grant us all the strength and opportunity to make this Ramadan better than ever. Ameen!