Telnet is one such client program. The best solution to this problem is to get and install a MUD client. This should be no more difficult to install than the other networking software. You are then informed 'Now in blocking mode. You then have 5 minutes to type in your statement without MUD output disturbing you.
Many clients written for MUDs have additional features through which they filter the output.
They will separate your input line from the output lines and automatically wrap words after 80 columns. As before, when typing in a command you should not press Enter until you have completed the command.